What I m talking about is a pic a guy (girl?) made:
It's his or hers so I m not going to post it without his consent.
Basically a naked model is so lit that the skin is almost white and blending in the also white background.
By contrast, the hair & eyes are very dark and the mouth very red. Very nice effect.
He told me that was done, as I said, by over exposure in V-Ray and very little photoshopping.
Maybe he doesn't want to unveil all his tricks.
I'll keep you informed if (hopefully) he answers.