Robert Knepper as Samuel Sullivan from "Heroes"
Original Ref http://www.rankopedia.com/CandidatePix/10602.gif
Airbrush, LOTS of Dodge/Burn and tool for detail and Sharpen/Blur tool for finishing touches! About 22 hours or so. I dunno I lost count :P
Also with the help of David Nagel's Photoshop Skin texture brushes!