American adult model Fantasia

This is far from perfect but does a solid likeness and is flexible enough when combined with a suitable checkpoint for realistic and semi-realistic results as well. Due to the nature of the training images it has a tendency to go NSFW (also depending on the checkpoint of course) - so use appropriate negative prompts to stay clear off that.

In the tests that I ran so far Photon gave very good results for photorealistic and XenoGasm worked really well for more illustration-leaning semi-realistic images.

Recommended weight from my tests: around 0.8

I ran most of my test images using DPM++ 2M Karras with 20 steps, a CFG scale of 5 using ADetailer with its default inpainting settings for faces.
Base resolution 512x768 (as was a significant number of training images) using 4x_NMKD-Superscale-SP_178000_G with an upscale factor of 1,5 and around 0,4 denoising strength.

Other settings may work better or worse - feel free to share yours!