This workflow is intended to be used with the GonzaLomo Flux model to generate an image and then refine the image using the GonzaLomo v4.0 Unity SDXL model. Unity will provide the image with much better skin detail and anatomical features.
Note that it's not required to use the GonzaLomo SDXL model as any photorealistic SDXL model should do a very good job at refining the Flux image.
One other thing to note is the refining prompt that is being merged with the original prompt via the Conditioning Concat node. You can put anything into this prompt that you'd like to emphasize in the final image. I included things like "skin pores and blemishes" to give the skin a less plastic Flux look. You could also add freckles. The amount of effect that this prompt has is governed by the denoise. If you want only a light refining then keep the denoise between 0.1 and 0.2. Go higher than 0.2 to allow the SDXL model to fully refine the image. I like 0.35 myself but I think that's a personal preference.