For better skin details, you can add these

Prompt：

(extremely detailed skin texture:1.3), (realistic skin pores:1.3), (filthy detailed skin:1.3), (matte dirty skin:1.2), (detailed skin details:1.3), (no glossy reflections:1.2)

Negative：

oily skin, greasy skin, shiny skin, glossy skin, plastic skin, smooth skin, low detail skin, blurry skin, overexposed skin, clean skin