As for the coloring, it's just light and dark for each surface, all done on one layer. ...and yeah, that's my color pallet to the right.

Thought it was cool to see Jay's working environment. So I've also taken a screen grab of mine. Nothing crazy here... just painting on a single layer set to multiply with a round brush. I set the brush "flow" to around 40%, 100% opacity, 75% "hardness".
