At first I thought the bottle was taking a break LOL! The colors and composition are great, it's just too bad that the subject wasn't sitting at the closer bench.
You found a very good subject for this challenge but there are a couple of issues that are hurting your score. First, I wish you would have removed the water bottle from the empty bench before taking this image. Second, you might want to try cropping this image so that the empty bench is the same distance from the edge as the occupied bench. This would really help balance this image and remove the red tile distraction on the left side of the photo. An added benefit to this crop would be the lightest part of the image would be on the far right, which would naturally draw your eyes from the empty bench to the occupied bench and evoke a comparison of the two.