Nicely stopped, but the overall image suffers from being too dark and having too much distracting detail in the background. I would get higher, shoot down and maybe use some fill flash also. That's just my opinion, and I could be wrong. Good luck with the challenge.
Great capture and a nice action photo. The shot seems a bit dark, so it might look better a little brighter and with a bit more contrast. Still, it's a really nice shot.
Love the triangular arrangement. A simple autolevels or playing with brightness/contrast would have removed the grayish cast. I like that you didn't cut the shadow of the foreground kid because it gives it more perspective.