i very like the story in your drawing.picture have very good composition ,you show foreground and background this makes the composition more interesting. using the color you have directed the viewer's eye to the main character , but if you have made the background darker , the hero would have been more noticeable (I've done overpaint that you understand what I mean pp.vk.me/c624823/v624823218/2e… )
details in your picture look good. Yellow and blue color emphasize each other.
very beautiful sandy wind is shown below . I very like it!
You gave a good volume of items, especially of the human body.
This wonderful picture!