Nice subject for the challenge. One thing that IMO would've worked a little better is a different color background that gives you more contrast compared to the bottom two golf balls. How would placing these on the lawn have worked? That would've also given you natural light, and maybe reduced the light reflections a little. Just a thought.
This picture would have been better with more focus and perhaps a different background. The color of hte background seems to blend in with the football.
This is an interesting concpet for a photograph in the games challenge, but I don't like the way the background removes the contrast from this image. Everything in the photo has a rather brown tint to it. I'm not sure if this photo was converted to be this way, but I think some contrast would greatly improve this....