This guy's name is Craig Mullens. He does pre-viz stuff for films and video games. His site is overflowing with purely amazing artwork. He has some personal stuff in there as well.
The film and game stuff is almost completely digital. I am simply astounded at his talent. What one fat, ugly stroke of the digital pen can be made to look like when wielded by this man is just amazing.
GoodBrush, AKA Craig Mullens