Ok, this is a decent start. Since the figure is mostly stylistic I'm going to just give some ideas and let your personal style take over.

First you might consider adding some texture,unless you are going for a simple paper cutout look. The anatomy for the arms is too long if you are doing formal anatomy but again if this is part of your style then maybe you could add some shadow or perhaps some hint of a joint midarm. The lines of the shirt are not the same dark curves found in the other lines, you may consider revising them they seem to stand out the most. Some symmetry is missing between the arms and this may detract from the image as a whole. The clouds or mountains look decent but you may want to give them more form by adding some shadow and light. Some areas may have too much anti aliasing for some people you might consider this.

 

Good luck. ;)