I can guess!
If you could have shot this from the other side, your backgound might have been a little furhter away and less cluttered. Also, a wider apperture than F5 would drag the eye to the subject. Mayby some selective blurring in ps?
dont get me wrong – it’s a nice shot, but the background is killing it for me. even crop from the top and the right to see how that bring attention to the riders.