The idea is really sweet, but your anatomy needs some work. particularly the wrist closest to the viewer is in a very awkward position and looks broken. From the way the forearm is positioned the wrist would flow downward rather than upward as you have it.

The background is very nice, one thing to work on might be to draw the character with the background so they flow together. At the moment it looks a bit like it was pasted over the top.

I like what you did with the lines to show the direction of the light and where it was coming from. keep working on your shading you're certainly going in the right direction.

It really is a lovely piece. I think you just need to practice more. take time to use references and draw the scene around the figure.