David Kassan

I recently started seeing references to this artist all over the place. His work is amazing, I like the drawings even more than the paintings, especially this self portrait. I think it shows how hard this man must work, he looks exhausted.
There is also a video of a 3 hour drawing condensed into 7 minutes. It is low res but still gives a pretty good idea of how he works. Have a look at his website and blog to see more.