A lurker fren with a tip for genners:
This might already be common knowledge for genners, but I've been dabbling recently and doing some testing/research of my own. I found I kept having a problem with genned faces having an annoying plastic/CGI smoothness to them, but I found a good combo to fix it
Use CodeFormer.pth + RealESRGAN_x4plus.pth, it'll do a lot to remove the CGI skin. Running it through multiple times might have an even greater effect. Hopefully this helps some anon.