Woah, man. You really put your skills to the test on this one. Honestly, I can't find any flaws. The coloring is nice, the porportions are right, and I just can't find anything not to like.
Everything about the picture is completely flawless. The positioning, the coloring, the detail is flawless. The only thing I think you can improve on in your next artwork is the varieties of color that were applied-5/5 overall