“My name is Roy Stein, and I am a CG artist and Illustrator based in London. In this short tutorial I want to give you a short walkthrough of the way I build up an illustration from start to finish. This image was created over 3 sessions and took approximately 15 hours to finish.”
http://www.cgarena.com/freestuff/tutorials/photoshop/royalassassin/index.html