I heard of a technique called micro bump. I can't find much about it online, but I assume it's something that simulates very tiny bumps on the skin so as the surface won't appear so flat when viewing close.
Look at this screenshot:
Notice his forehead has lines where the spec light shines. I'm trying to do similar, but I applied a separate bump and the results are not even close.
Any idea how they get those super nice lines\bump across the skin like that?
Thanks in advance.