I like how you included the rocks in this. It's kind of weird because I look down at the rocks, and they seem so small. So I expect the rest of your scene to be much farther away. So this makes me question the depth of perception in my head or the perceived size of the rocks. Beautiful tones in this.
I kept asking myself if the photo would be better without the rocks at the bottom, but I think you were correct in your choice of cropping. You have about three contrasts here (rocks, boats, buildings) and I think it looks great. 8