Larger images will help your votes, DP allows 640 pixels on the long side. Try that and you should get better results. I had to learn that the hard way, low challenge results.
I wish that the image size was larger so that I could give more comments on the technical aspects of the shot. It seems to be pretty clearly in focus. I wonder if the shot might work better with the light moved to either the right or the left, rather than in the center.
You're probably going to get hammered for having too small a shot. That doesn't bother me quite as much as it does many, but with such a simple subject, having it centered doesn't really work that well. Try framing it so that it shows up either one third from the left or the right instead. A contrast boost might also be in order, as the scene seems a little washed out. The subject also doesn't seem to be that compelling.