I really like the photo with the water area in front of the wheel (the bottom ~1cm) cropped out.
i'm not photography expert but what I do like is that the wheel area is made to be like a border. i have no issues with the empty sky..but would prefer if the colour gradient is smoother (maybe its my screen, but i can the line where the colour changes from one shade to another). The moon makes the photo more interesting? compared to just another shot of the wheel?
Anyway, as I said, I like it. =)