I really think this is a great composition. The sky is very dramatic and I like how the city is dwarfed to the point of being a border for the sky and gull. However, the haloing around the gull is the first thing I saw. It's pretty distracting. Bet this would look great with a little less sharpening on the bird, although the sky looks perfectly sharpened as it is.
I am not sure about the "perspective" aspects of this shot. It does not grab me in this regard. However, the cropping is intriguing to me. Was that done on purpose, or was it how it was framed? I like the image a lot in general.
Not liking how that gull is cut off, as it is the subject. Nonetheless, there is something that oddly works about this photo- all that emotive gray, I think.
Would have worked a lot better for me if all of the Gull had been in the picture and if that little .. something .. wasnt peeping into the frame at the right.