I'm not really talking about a creative effect, more about renders aiming for "realism" (posted to the Portraits/Realism sections).
If your aiming for realism ....  well my armpits and knees don't have gigantic flaps of skin sticking out, (not yet anyway). Nor are my nostrils a glowing light sourse. Two minutes in Photoshop or any 2D program is all that's needed.
Maybe we've been looking at renders of Mike and Vicki so long we've forgotten what real people like.

ps. I'm not into heavy postwork myself. If I can't go from idea to Poser to publication in2 or 3 days, I ditch the project. (Many would say that this explains the quality of my gallery and they probably have a point.)