Good idea for a picture, you might try using a higher apature setting to deepen your depth of field. That would make the image more focused overall, though your camera may not have manual controls. Excellent contest entry.
could be sharper. reasonably good choice of rectangles, the two things that draw my attention are the cans and the little teeny tree that's sprouting. if they're what's important, they're all that needs to be included, get right up on them, the picture gets less busy, easier to focus on, easier to understand.