Not to bad, Sasuke's facial expression is kind of smug in this panel, if you know what I mean. Well, I think you did a decent job coloring this panel, but there's obviously room for improvement. Just keep practicing, and coloring. The more experience you have, the better you'll get, as long as you recognize the things that you need to get better at. Anyways, good effort in coloring this panel, and keep up the good work.