As a personal preference, i dislike the lens flare, as to me it smacks of imperfection, and as Mark says, draws the eye away from the rider. Also to me, an important aspect of a photograph is depth, although you have intentionally removed it - for abstract purposes i presume. I think that the third photograph posted on this page is the most pleasing, as it seems well balanced, isolates the rider in terms of focus, but still allows for some depth as the floor and shadow remain in tact.