Very basic workflow for generating what I think are high-quality ZIT 1girl photos.

Very simple T2I using ZIT (basically the template), upscale with SeedVR2 (basically the template), then face detail with ZIT (I'll try to add different versions, but my default uses SAM2 for face detection and inpaint crop and stitch instead of the face detailer node).

SAM2 - adjust the threshold as needed

Face detail - adjust the denoise and steps as needed