It's an unusual and interesting composition. My personal view, I think the photo would be of even greater interest if the middle "thing" had not been there and we were left with just the starfish and the small island. In addition, I'd be inclined to get a bit more sky in the photo rather than this nearly 50:50 split you currently have; the clouds have some interest, and I like the notion of the main subjects "down below" in the different medium of the water.