I think this is too small for me to be able to decide whether it would be good or not. Nice composition, but quite unsharp, and way to small. I can't really catch the opposite of old and new this way, maybe if it was bigger.
Picture is too small, please check the site recommendations for sizing, Also, from what I can tell there is only young boys in the photo. How does that fit into the challenge.
The picture is too small... I suggest using advantage of the 640 pixels lenght allowed. The focus could be a lot better. It's too bad because you do have a nice composition, I like the symmetry created by the fences. The light is not bad either.