That's pretty amazing - okay well, if that's the skin naturally, it's got to be lighting that's creating such a great effect. What lighting setup did you use/have? I notice you've got quite the fall-off happening too. It's a terrific result, and it's the very thing I'm trying to learn/accomplish also. I've tried a node technique here and there with mixed results (though I don't pretend to know precisely what I'm doing - lol)
Any clarity you're able to provide would be much appreciated!