When I'm in the mood I'll sketch something up by traditional means and then do some quickie colors in photoshop. This sketch was actually done a few days ago during a work meeting, I didn't intend to color it but I started fooling around with some flats and took it a little further. I didn't want to call out too much detail since it starts to expose flaws in the original, which admittedly I wasn't paying too much attention to at the time.
Pencil sketch: blue line on paper, 15 min. Colors: Photoshop, Wacom, 30 min