Careful with the USM on water... it makes the water look hard and unnatural. What I usually do is apply USM to the entire image, then use the history brush to paint back the water.
This is beautiful, well done!!! the color in the sky mirror the color in the sea. You make something special with this picture, somehow it can be a story, an art, and you feel it can come to life all of a sudden. It is good!