This is a good image but has the potential to be a great image. IMHO I would do the following:-
1) crop out the far right pier leg (the one that is just protruding into the shot) it spoils the symmetry,
2) clone out the sun, I feel it detracts from the main subject
3) give the top of the image more room around the gull. The crop for me is a little to tight on the gull.
With the best intentions