The over all anatomy is very well done nothing really seems out of proportion and it rather does look good. The colors seem decent and match, but there are a few places like the hair that should have been colored a little darker and then some more values to make the arm stand out from the hair so that it looks a lot more 3 dimensional. I think for taking a photograph and not scanning on the image you did a good job. I do have to say that the stars are a good detail but I think would have looked better if you had done them yourself.

Over all good job! Just work a little more on values with the water color pencils.