[DJN]

Drawing realistic fine art is a rare skill, which like many skills can learned with sufficient devotion. 10000 hours, I think.

That said, contempory artists like Kelvin Okafor whose renditions of Heath Ledger, Rihanna, Princess Diana still amaze me.

Do enjoy - http://www.flickr.com/photos/kelvinokaforart

His blog also contains tutorials of sorts - http://kelvinokaforart.blogspot.com