
“Generally, I like to start out with a sketch, but for this piece I had the confidence and vision to head straight into the painting stage. I knew I wanted a dark image, so I flooded the canvas with a dark tone that I could build upon. Using Photoshop’s Airbrush tool, I started slapping on simple light to give shape to the face that I planned on painting.”
http://www.3dtotal.com/team/Tutorials_3/makingof_hateful_draft/hateful_draft_01.php