Love the movement of the water and the pose of the gull. I agree that a slightly different crop might serve you well here - to get the main subject out of the dead center. I would also suggest deepening the tones of the water to create more contrast with the gull. Nice shot.
this is a nice picture, lighting is good, focus is spot on, you might try a closer crop, try the rule of thirds ;) just crop of the bottom and the right side so the bird would be on the lower right third of the photo.