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Your a programmer, so concentrate your time on getting the game built.
I'd agree with this if this was a business effort trying to get a polished product out the door. But this something he's doing for fun. And drawing is fun. If you can't draw well, do what the south park guys & the guy that draws Dilbert did; make it cheesy on purpose. Remember, if you can't do something well, learn to enjoy doing it poorly.