For my "Airbrush" class (read: "Photoshop" class) we drew a self portrait and then came up with three variations of that drawing in Photoshop. In comics order: The black and white lineart, my "standard" coloring style with some drop shadows (which I usually don't do), a coloring with all of the lines colored as well and a "monotone" coloring. Fun! And good practice...
9" x 9" - India Ink, Adobe Photoshop - February 2006