HUMAN — Flux Dev Checkpoint

The most advanced human realism checkpoint ever built on Flux architecture.

What is HUMAN?

HUMAN is a custom-trained checkpoint built on Flux Dev, engineered from the ground up with a single obsession: making AI-generated humans indistinguishable from real photography.

This is not a general-purpose model with human capabilities. This is a model where every architectural decision, every training choice, every calibration step was made in service of one goal — biological, photographic, anatomical human realism at a level the Flux ecosystem has never seen before.

The results speak for themselves. Images generated with nothing more than the word "woman" produce editorial-quality photographs that challenge the perception of what AI generation is capable of.

Core Philosophy

Most models optimize for aesthetics. HUMAN optimizes for truth.

The human body is extraordinarily complex. Skin is not a flat surface — it has pores, micro-imperfections, subsurface translucency, varying tone across different facial zones, reactive blush in cheeks and nose, visible capillary texture. Eyes are not colored circles — they have fiber structures in the iris, specular highlights, environmental reflections, wet glistening surfaces. Hair is not a mass — it is thousands of individual strands with different light absorption properties depending on angle and moisture.

HUMAN was built to understand all of this, and the sample images throughout this page demonstrate exactly that.

Skin Realism — A New Standard

Skin rendering is where most models fail. They produce surfaces that are either too smooth (plastic), too noisy (artificial grain), or incorrectly lit (flat, no depth). HUMAN solves all three problems simultaneously.

What HUMAN does with skin:

Pore Structure — Visible pore texture that scales correctly with distance. In extreme close-up shots, individual pores are present on the nose, cheeks, and forehead. At portrait distance, the texture reads as natural skin without becoming distracting noise.

Subsurface Scattering — Light penetrates skin correctly. In backlit and golden hour scenarios, the ears, fingers, and thin skin areas show the warm translucency of real human tissue. This is one of the hardest effects to achieve in AI generation and HUMAN produces it consistently.

Tone Variation — Human skin is never a single color. HUMAN correctly renders the warmer tones around the nose and cheeks, the cooler tones at the temples, the slight darkness under the eyes, and the color transition from face to neck. This variation is present across all phenotypes in the model.

Blush and Rosiness — Natural rosy color in the cheeks and nose bridge appears organically across generations without being prompted. This micro-detail is what separates a photograph from a render.

Imperfections — Subtle marks, slight asymmetries in skin tone, faint under-eye shadows, and natural variation in lip color all appear spontaneously because the model understands that perfection is not human.

Eye Rendering — Photographic Depth

Eyes are the most scrutinized element in any portrait. They are also the element where AI generation most commonly fails — producing eyes that look like painted circles, that have incorrect highlights, or that lack the wet, living quality of real eyes.

What HUMAN does with eyes:

Iris Fiber Structure — The iris in HUMAN-generated images contains visible fiber and radial structure. At close range, the texture resembles actual iris photography, with variations in density, color saturation, and shadow patterns within the iris itself.

Specular Highlights — Light reflects off the wet surface of the eye at the correct position relative to the light source in the scene. If the light is coming from the left, the catchlight appears in the upper left of the iris. This positional accuracy is automatic.

Environmental Reflection — In several sample images, the environment itself is reflected in the corneal surface of the eye. Outdoor scenes, room windows, and ambient light sources appear as subtle reflections in the eye surface. This level of optical simulation is extraordinary for a generative model.

Emotional Range — Perhaps most importantly, the eyes in HUMAN generations express genuine emotion. The difference between a slight smile reaching the eyes versus a neutral expression is rendered with the subtle muscle changes around the orbital area that make the difference between a photograph and a generated image.

Hair — Individual Strand Fidelity

Hair generation is technically one of the most demanding tasks in image synthesis. HUMAN approaches hair with the same precision applied to skin and eyes.

Strand Individuality — Hair in HUMAN outputs reads as individual strands, not as a mass texture. Fine flyaways, baby hairs at the hairline, individual strands catching backlight and becoming semi-transparent — all of these details are present consistently.

Physical Behavior — Hair responds correctly to implied environmental conditions. Wind creates natural movement patterns where the hair mass moves as a coherent whole but individual strands separate and fly. Wet hair clumps into correct moisture-weighted clusters. Braided hair shows individual strand texture within the braid structure.

Light Interaction — Rim lighting creates a halo effect around hair that accurately simulates light passing through semi-transparent strands. In backlit golden hour shots, the edges of dark hair glow amber. In overcast conditions, hair absorbs light evenly without the artificial shine many models produce.

Color Complexity — Hair is never a flat color in HUMAN. Dark hair shows blue-black reflections in direct light. Brunette hair reveals auburn and chestnut highlights at the ends. Platinum hair differentiates between the cooler root shadow and the warmer mid-shaft tone. Blonde hair shows natural variation between warm and cool strands.

Anatomical Precision

HUMAN was calibrated specifically to understand human anatomy at a level that affects every generation.

Facial Structure — Bone structure, muscle placement, and fat distribution are anatomically correct. The relationship between the orbital bones and the eye socket, the zygomatic arch and the cheek, the mandible and the jaw angle — all of these proportional relationships are correct and consistent.

Natural Asymmetry — One of the most important aspects of human biology is that faces are not symmetric. HUMAN consistently produces faces with subtle, natural asymmetry — one eye slightly different from the other, the mouth not perfectly centered, the nose bridge with slight natural deviation. This asymmetry is what makes faces feel alive.

Neck and Clavicle — The connection between face and body is handled with particular care. The sternocleidomastoid muscle, the clavicle shape, the shadow dynamics at the base of the neck — all rendered with anatomical accuracy.

Shoulder and Back Anatomy — In samples showing shoulders and back, the scapula, deltoid, and trapezius muscle groups create correct shadow patterns as the body moves. The curvature of the spine, the slight rotation of the torso, the natural compression of fabric against the body — all correct.

Lighting Mastery

HUMAN was tested and optimized across the full range of photographic lighting conditions. Each presents different technical challenges, and the model handles all of them.

Golden Hour / Backlight

The most demanding natural lighting condition. Sun positioned directly behind the subject creates rimlight halos, lens flare, and the challenge of correctly exposing a face against a bright background. HUMAN produces all of this with photographic accuracy — including hexagonal aperture lens flare elements, golden rimlight on hair edges, and the warm ambient fill light that bounces up from golden hour pavement.

Studio / Controlled Light

Single source dramatic lighting creates hard shadows that reveal the geometry of the face. The shadow of the nose falling across the upper lip, the shadow of the cheekbone cutting across the cheek, the shadow under the chin — HUMAN renders these light-geometry relationships correctly without being prompted about lighting setups.

Overcast / Soft Diffuse

Soft, directionless light is forgiving but flat. HUMAN adds the micro-shadow detail that gives skin dimension even in flat light — the subtle shadows in pore structure, the slight darkening under the lower lip, the shadow at the philtrum.

Dark / Low Key

Dramatic low-key lighting with heavy shadow fall-off. The transition from light to shadow across the face follows the correct falloff curve for different skin tones. Dark skin in low light maintains its tone and richness rather than collapsing to pure black.

Phenotype Diversity at Equal Quality

Most models perform well on one type of face and degrade on others. HUMAN was built to deliver identical quality across radically different human phenotypes.

Dark Hair / Mediterranean / Olive Skin

The foundational phenotype of the model. Sharp features, olive skin tones, various eye colors including striking green and hazel. Responds beautifully to warm golden lighting.

Platinum Blonde / Nordic / Fair Skin

One of the technically hardest phenotypes — very fair skin, platinum or white hair, light blue or grey eyes. The challenge is differentiating whites: white hair vs white clothing vs white background all read as distinct tones and textures. HUMAN handles this with precision.

Dark Skin / High Contrast

The phenotype where most AI models fail most dramatically. Deep, rich dark skin tones require careful calibration to preserve tone, show correct specular highlights, and avoid the common AI failure modes of either making dark skin appear grey/desaturated or over-brightening highlights to an unrealistic degree. HUMAN gets this right. The richness and depth of dark skin tones is preserved across all lighting conditions, including the technically demanding combination of dark skin with platinum blonde hair.

Mixed and Diverse Phenotypes

Beyond these primary types, HUMAN generates diverse and mixed phenotypes with consistent quality, demonstrating genuine understanding of human biological variation rather than pattern-matching to training examples.

Water and Environmental Physics

Fluid physics in image generation is notoriously difficult. HUMAN demonstrates exceptional capability in this area.

Falling Water — Individual water streams rendered with correct physical trajectory, light refraction through water droplets, and bokeh behavior of out-of-focus water streams. The cascade pattern of water falling on hair and skin follows physical distribution patterns.

Wet Skin — The difference between dry skin and wet skin is significant and complex. Wet skin has different specular properties, different color depth (darker, more saturated), and shows the adhesion of water droplets to skin surface. HUMAN renders all of these differences correctly.

Wet Hair — Moisture causes hair to clump into heavier, darker strands with different light behavior than dry hair. The transition from soaking wet sections near the water source to damp sections further away is natural and gradual.

Wet Fabric — Wet white fabric becomes translucent in a specific way that depends on fabric weight and weave. HUMAN simulates fabric transparency under moisture with accuracy that extends to the underlying body forms becoming visible through saturated fabric.

Accessory and Detail Generation

A distinctive capability of HUMAN is the spontaneous generation of accessories and fine details that are anatomically and physically correct without being specifically prompted.

Jewelry — Earrings, necklaces, and bracelets appear spontaneously and are rendered with correct metallic properties. Gold has warm specular highlights. Silver has cool, sharp reflections. Diamonds and crystals show light dispersion. Chain links are individually defined with correct shadow and highlight relationships.

Fabric Details — Lace patterns, whether black gothic lace, red baroque lace, or white bridal lace, are rendered with individual thread structure, correct transparency, and three-dimensional shadow on the threads themselves. The patterns are coherent and consistent across the garment.

Glasses — Sunglasses with tinted lenses reflect the environment at the correct angle for their position on the face. The rim of the lens, the nose bridge, and the temple arms are individually rendered with correct material properties.

Demonstrated Style Range

HUMAN has been tested across the full spectrum of photographic and fashion photography styles. All styles are supported at equal quality.

Editorial Portrait — Clean studio shots at various distances from tight close-up to three-quarter length. Consistent across multiple sessions.

Street Fashion — Urban environment, natural light, movement implied by hair and fabric. European city aesthetics with correct perspective and depth.

Beach / Outdoor — Full body in natural outdoor light. Correct interaction between sun, skin, sand, water, and sky. Full body proportions maintained correctly.

Dark / Gothic — Low key lighting, dark backgrounds, dramatic fashion. Black lace, chokers, dramatic makeup all rendered with precision.

Vintage / Analog Film — Film grain, color grading consistent with analog photography, aged border effects. The model understands and applies photographic era aesthetics.

Red Lace Editorial — High fashion with complex red lace garments, coordinated makeup, elaborate hairstyles. Color palette consistency across skin tone, fabric, and cosmetics.

White on White — The technically most demanding style: platinum hair, white knitwear, white background. Three separate white tones maintained as distinct with correct texture differentiation.

Recommended Generation Settings

Standard resolutions 512 x 640, 600x800, 640x960

Resolution: 540x540 mark the Hires.fix, result 1080 x 1080 pixel

Use these recommended settings for generation:

Sampling method: Euler/simple

Sampling steps: 16-30

Distilled CFG Scale: 3,5 - 8

Skip clip: 0

Sampling method: Euler/beta

Sampling steps: 16-30

Distilled CFG Scale: 3,5 -8

Skip clip: 0

Prompting

HUMAN requires minimal prompting. The model has deep understanding of human subjects and generates photographic quality from simple descriptive input.

Simple prompts work extremely well. The model fills in the photographic and biological details autonomously.

Describe what you want to see — phenotype, clothing, environment, mood — and the model handles the photographic execution.

Tags

flux flux-dev checkpoint human realism photorealism portrait woman biological-realism human-phenotype natural-anatomy skin-texture fashion editorial photography diversity phenotype

⚠️ IMPORTANT — Compatibility Notice

This checkpoint was developed and tested exclusively in ComfyUI.

Use only with ComfyUI for guaranteed results.

Versions of Stable Diffusion WebUI (AUTOMATIC1111) and Stable Diffusion Forge are not recommended and may present failures, artifacts, incorrect generations, or unexpected behavior.

The author does not provide support for generations made outside the ComfyUI environment.

✅ Recommended: ComfyUI ❌ Not supported: AUTOMATIC1111 / Forge / other WebUI variants

⚠️ CONTENT WARNING (NSFW):

This merge is uncensored and capable of generating high-quality explicit NSFW content and nudity. It has a tendency towards revealing clothing in casual settings.

For SFW results: Strong negative prompts are highly recommended (e.g., nude, nipples, explicit, nsfw).

⚠️ LICENSE & PERMISSIONS (READ BEFORE DOWNLOADING)

1. PERSONAL USE ONLY This model is provided free of charge for Personal, Non-Profit, and Research use only. You may use it to create images for your personal portfolio.

2. STRICTLY NO REDISTRIBUTION

❌ DO NOT re-upload this file to Civitai, Hugging Face, or any other platform.
❌ DO NOT host this model on third-party generation services (e.g., Tensor.art, Mage.space, Telegram Bots).

3. COMMERCIAL RESTRICTIONS Using this model or its outputs for commercial revenue (Influencers, Ads, Stock Photos) without a license is PROHIBITED.

💼 COMMERCIAL SERVICES & COMMISSIONS

I do not sell the model file for commercial use. Instead, I offer premium AI solutions for brands and agencies:

✨ Exclusive AI Influencers: I create and manage consistent digital personas for Instagram/Social Media.
🏢 Corporate B2B LoRAs: Custom training for brand identity and mascots.
📸 High-End Image Packs: Monthly content packages for your brand.

To hire me for professional AI Modeling services: 📩 Contact: [designxtreme@outlook.com]

Recommended settings:

Standard resolutions 512 x 640, 600x800, 640x960

Resolution: 540x540 mark the Hires.fix, result 1080 x 1080 pixel

Use these recommended settings for generation:

Sampling method: Euler/simple

Sampling steps: 16-30

Distilled CFG Scale: 3,5 - 8

Skip clip: 0

Sampling method: Euler/beta

Sampling steps: 16-30

Distilled CFG Scale: 3,5 -8

Skip clip: 0

Files with SHA256: 7064c7f07494c89b9511187acabe0ef465e90d378d0d7ff80991407c2c008850