I think the last render is awesome! Only the eyes need work, a reflection map or some kind of specularity change. To get rid of the plastic-like look to it. I read an awesome article in 3DArtist a while back about lighting and people, perhaps you can find it online... Still, the article talked about making two tiny spotlights, and smack them RIGHT in front of the eyes, tracking to the eyes objects. Screw with them a bit, and you'll get a cool effect. Another thing, are you using and rear lights? They can add to realism as well... Just some ideas!