the skectch looks fine, but I think you could have some high quality images that people want to comment on simply by using your space better. Fill up your compostion, use crisp colors, and have your people doing something. Even when you're practicing and not that good yet you can be using simple things like that to make nicer pictures. Check out this draw to see how your effort can be put to good use:
http://cellosoft.com/2draw/view/17088/

good choice of image Dino lol (specially since the safety bar is there now)