Colors have inherent luminance values.
Because of this I find it much easier to construct lighting in grayscale:

He's a bit low to mid key.
Some higher values could help.
I like his overall shape.
The drawing could stand a lot more exaggeration, but that's more of a stylistic choice depending on what you want.
« Last Edit: April 10, 2012, 10:32:29 am by PixelPiledriver »

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And knowing that it is, we seek what it is... ~ Aristotle, Posterior Analytics, Chapter 1