I really loved this. I think you hit all the customizable marks.
I think something that would have helped would be to have it show the character as it's going, like having a little preview of what you're doing and generally how it's going to look while drawing.
Only partially related, I spent some good time drawing my little skeleton guy and then the game ended and I forgot to take a screen shot. :( So I would let the player have one more shot of their little guy while knowing it will be the last time,
Great concept and execution.