All of that negative space in the water is just screaming for some text! I'm not sure I like the horizon right through the center, but with text added at the bottom, it might work.
The refections are a bit too weak to make this work IMHO, with just a boring area of brown at the bottom. The building to the left also looks a bit chopped off, so the composition isn't spot on in that respect either. On the good side, it's nicely exposed with no burn outs, so good job there!
A pano would have been gorgeous here. I don't think you could have done that within the rules, unless you did some serious cropping. As is, there is just a little too much water. But I certainly like the colors. You should have taken advantage of the special rule, and added some text to let us know what city this is.
A cool cityscape! I might have added text in the water area since text is allowed in this challenge. As it is, it seems like the shot is a little too evenly divided in half. I probably would have cropped it so that there was less water and more sky, or fill the water with appropriate text.