Like the composition and idea behind it, though not sure about the b/w bit... firstly it lack contrast against the other part of the image, and B/w is not portraing autumn as your title suggest. Maybe a play with reds/golds in the cental image will work better agaisnt the blue of the sides... the right reflection is a bit strong too (not that matters much) - maybe just have the refelction of the sky?
I had a quick play... hope you don't mind Anyway, I like the concept, and the result is good