The composition of this just doesn't do it for me. I like the idea of the lone swimmer returning from the sea, and the shadow and the use of silhouette is effective, although I would have preferred the figure to have been just a little larger and further into the frame.
It might have been sunset but the picture doesn't indicate this. The shot is actually kind of boring. The items that draw your eye (the person and the umbrella) aren't large enough or have enough detail to really sell this shot.