Oh wow seriously? Not too sure about that girl then. This is the original [link] by a very talented young fashion photographer and a friend. I would contact her and let her know about the pic at the very least.
THANK YOU! It's just a matter of practising over and over again. But the most I learned by watching professional painting videos and analysing materials, surfaces and lighting.
But one more important thing: you need patience and time. On this one I worked about 13 hours. And if you need a break - make a break. Don't paint when you don't feel like it. Finally I finished this in two weeks.. Take your time.