I like the composition and idea!
My main concern - it doesn`t live up to the title, it`s more like grey and ... another grey. I appreciate that it could be due to a scanning problem, but then could`ve been fixed anyway in PS or similiar.
The composition is excellent although my impression is that it`s a bit tilted to the left. Also there is some grey mud in the left (white side) of the reflection that could`ve been cropped(bottom 5mm) if not eliminated during the shot.