My honest comment : It feels empty. The shadings are ok though you can still add a little more "feel" to it. The thing is, it's too green and empty. I'm referring to the green background. Of course everyone knows that Lee is highly associated with green but certainly you can add more colors/gradients/tones/shadows to it to make it look more interesting. I applaud your effort nonetheless and I think that you are all set to move to the next level. Continue to practice hard (not like me >.> who have not practiced for about 4 month now) and you will only get better each time. I look forward to seeing more from you. Keep it up!!!
Hmm I like it, but since you are looking for feedback..hmm.. the upper body and the face seem a little blurry imo. then the jacket lines seem to be a bit messy perhaps not redrawn. Then again, that's not really coloring but cleaning.^^ I wish you good luck.