Fun subject with some nice movement. You can really see he's having fun. This image is very out of focus, though. That's sometimes hard to deal with when you have moving subjects.
Subject is off center, which is nice because as this swimmer moves, it gives him space to go in the frame, as it were. I love the color of the water, too, and the shadows made by the water. I wish the lighting were more interesting on the swimmer himself, though, and I also wish it were in focus.
good subject meets the challenge well but the whole pictures out of focus and there's too much glare try a polarizer and maybe lower apature and higher shutter speed if possible a 4