Stump portrait - color

Just added some Photoshop colors to the pencil drawing. I'm trying to develop a decent method of adding color, without resorting to inking, while still preserving the integrity of the pencil drawing. Right now I think I've found a decent method involving Hue/Saturation adjustment layers and the Color Range selection tool.

I also developed more of his chest and upper body; but the perspective is creating some issues, so I've cropped out the real problem areas until I can get a decent photo reference.