It seems a common theme that images which score at 5 or below lack contrast. Also, in a picture like this (and a challenge like this), I really think about B&W. The color isn't helping too much here, so get rid of it. I liked a B&W conversion using a majority of the blue channel. (if you are using PS, just click ctrl-3 to see what it looks like). I also decreased brightness by -10 and upped contrast by +20. Finally a polarizer might have reduced the glare of the bricks a bit and brought a little more color out.
As far as the challenge, I think the picture suffers a bit because there are competing patterns (the curved bricks, the bench slats and the brick wall). The winners tended to have a picture which had one predominant pattern we could latch onto. Here we aren't sure where to concentrate our attention.
Good picture. It is clear, is inviting & on task / has several repeating patterns. Minor note: because there is no One compelling subject I think a lot of viewers will flit by & ding you. Good luck. 8