This is kinda cool. I like the feet being in the shot. I think a lot of people would probably prefer them not to be there. I think I would have tried to either perfectly center the image, or moved it further to the side, if possible. The other thing you might try would be to crop this at the 640x427 size to further accentuate the vertical nature of the shot.
Since the subject is so symmetrical, I might have cropped to center it a little better. Don't know how effective the inclusion of the shoes is. Maybe if you'd jumped. Not embarassing.