I like the composition of this image but you need to use the full 640 pixal size you are allowed. I would also suggest a thinner border, as think borders seldom score well. 6
I don't know much about super wide angle shooting, so is the center of this shot a little soft? Or is that the nature of the lens? I think this is very interesting. I like how you used equipment (lens) to manipulate the shot into being the theme.