#1 as a lot of potential. I would crop the left side to get rid of the cut seagulls and get rid of the vignetting (personnal taste, I don't like vignetting, it's up to your preference).
#2 as potential for a great shot. By any chance would you be able to get a little more on the right and top? It would be nice to see more were the seagull is going than the post. The colours are once again a little to cold to my taste. Outside that, it's the best of the series.
#3 It's a little busy on the right. I would crop the sidewalk. Your horizon is not straight and the colours are a little too cold. Nice bridge though (did my undergrad in civilian engineering!)