I am a bit anal about aspect sizes for my images, and I virtually always use 4:3, 3:4 or 1:1.
Just me, I find 4:3 a pleasing ratio (probably watched too much TV as a kid, I need to upgrade to widescreen...), but hey, we are all different - thank goodness!

I assume you were on some sort of a large boat to give this pleasing point of view. I think an even higher point of view would also be a nice image with the line of the jetty. I see that the English word is derived from the Old French word, jetee (excuse the lack of accents marks); is the modern French word the same?
Interesting how the city is built up above flood stage. Unless these are flood gates or locks? What is in the middle of the channel in the 2nd photo?