My go-to workflows for use in comfy UI.

You will need some additional nodes, in the comfy manager go to 'manager'>install missing custom nodes and that should do the trick.

My SDXL/PONY workflow uses Clip Vector Sculpting to improve image quality

The FLUX AIO and FLUX + Upscale AIO V1 is as simple as possible for users using one of the AIO (All In One) safetensors checkpoints here on Civit and not the Official DiT only version from Hugging Face.

The FLUX + UPSCALE + Lora v3 is the one I use most, and is compatible with NepotismFUX V2, it's as simple as possible while still allowing you to change whatever you need on the fly. perfect for intermediate and expert users alike.

V2 of my Flux Flow + Upscale for users that load the Flux model separately.

I changed the default settings inside the node; upscale should work much better.