Experimenting with HDRI and PBR skin, If someone could help me how to get a realistic hair and more realistic skin, it would be really helpful.
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Imo, the skin looks more realistic than anything AI has produced thus far, so you're on the right track. Even the body type is more "realistic" versus that of every AI body looking like something out of a fitness magazine where females have 6-Pack abs, 44EEE boobs and 46-inch hips/ass, which is contrary to body types in weightlifting anyhow. Your render looks good to me but I'm no technical expert, just a student of aesthetics.