There is a lot of good stuff in this......the only things I can say on improving is it seem like the flow almost got away from you but its not bad, so just watch for that, and the light source......it seems like you have an understanding of light, but there are a coule of things you can do to make it pop!! I believe you are in GIMP if i remember right....maybe I can open it up again and try to figure out the equivalent of some of the things I do!! Really good job!!!