As long as you don't zoom in the rough coloring is totally managable :) great job!
The head is way to big, you should really consider looking at some real life examples when you start with your next picture, also you should give here some expression since the almost invisible mouth makes the picture a bit dull.
Also, the coloring mthod you chose made the picture look very flat, of course that 's your choise but it's a lot more interesting to look at something that pops out at you
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