Good pose... but a few things to be concerned about. The bow blends in with his hair in the coloring. His hand on the bow should be larger than the other one, in fact at LEAST 2/3 of the size of his face if it was open, since it's in front of his body and things closer to the viewer are larger. I like the style you have for his hair, it looks very smooth and flows nicely. Also if you continue the color the bow has at the top, it will look quite nice as well! I'm no good at backgrounds, so I can't help you there, sorry.