By Envy from CivitAI (https://civitai.com/models/231187/envy-better-hires-fix-xl-01)

"Adds contrast, detail, and quality improvements to hires fix. Improves hands a bit. Gives more realistic skin textures on photorealistic models."

Envy Better Hires Fix XL 01 [SDXL] (v1.0)