You asked for an in depth comment of you shot in this abstract challenge.
First off, well done on your top 20 very nice score indeed. you have a compelling image here. You are tack sharp, clarity is good. Your angles are pleasing to the eye.
I played a little with this shot and found that adjusting the contrast gives it some more interesting depth, neutrals in the selective colours brought out colours that where hidden as well. Just playing around sometimes to see what can be done with these tools makes for some amazing results and downright terrible!!