I really like this picture!! The colors are great and I like the composition as a photo on it's own. I don't think the ball was right for this challenge though, it draws focus and is the opposite of the right angles. Would have been great in the contrast challenge!
Interesting composition. I feel that sharpen the ball a tiny bit would give it more impact. Needs a little work with contrast and brightness. The subtle browness light on the bottom right white sqare are distracting.