A little small to be able to see a lot and a little too busy for me in the background. It's barely bigger than the thumbnail though! I think it was a great idea which could have been exectuted better.
Your composition looks very good, and the color of the umbrella is interesting. I'm probably being redundant this late in the vote, but the small size makes it very difficult to see detail. Resizing for the DPC maximum would really boost your score.