i like the layers of blue that you have captured - i just don't see a specific item to draw me into the photo. The sky seems a bit noisy and the overall image is a bit blurry or out of focus.
This is a very pretty sky. I don't like the water because it's so dark but the sky looks very good. You might want to make sure the horizon is level next time before you shoot. This will keep you from having to try and straighten it in processing.