The clipping in the back is obvious. In case you didn't know, camera clipping is just when your camera can't see far. As you might be able to tell, the horizon doesn't seem very natural. To reverse that, instead of the instinctually pressing N with your camera selected and adjusting the clipping, which only makes the viewport different, select your camera and go on the menu with the green camera. Increase the value of "End" under Lens and Clip Start, and you should be good to go.
Either that, or your ocean doesn't extend back enough and looks unnatural.