Upload & Sell: On
Looks like you got low to the ground for this shot, which is good. I always like the expressions of these gulls.
Comp could improve a couple of ways.
1. Move the subject off center. In this case, with the head tilted to the right, I might take some off the left, using the "rule" of the bird looking into, or flying into the frame....the larger area.
2. I wish there were more separation from the background. A different angle, also taken low to the ground, might have found a spot where you could get the darker rocks behind the head. More practically, getting his head and "shoulders" above the rocks with the water behind the head might also improve. Not easy, because you have the grays and whites of the bird with similar tones in the water, making for a challenge for tonal separation.