Actually, the only reason was that there were lots of boats, and if I'd gone any lower they would have messed up the one basic colour of the background. I tried cropping it square, but didn't really like it. I did take a few horizontal shots, but they were also constrained by ugly stuff I didn't want in the photo. In the end I liked this one the best.
I like the angle and the colour mix in this shot, but I find all that empty space at the top not needed. I'm sure you framed it this way for a reason though, and I would love to hear your comments.