Back to comment. I almost did a similar shot for this challenge. You found a good path to take the image but the camera angle is a bit flat to strongly convey the up from the ground perspective. This image would probably score better if the whole body of the rider were visible.
Darn it, why so small? I'm giving you a 5 because there simply isn't much I can judge on here. Wouldn't mind seeing this one larger though, so please make sure you at least post a large outtake of it after the challenge, ok? :) Cheers.