Night shots and water shots are two of my personal favourite themes to shoot. You have managed to do both at the same time. I am jealous!
In my opinion, the composition is unbalanced as the eye is being drawn out of the picture to the left. The right side is dark but has an arrow pointing left (generated by the lights on the steps and their reflection reinforcing the darkness of the quayside). This leads the eye to the much brighter area on the left, but there is no containing vertical at the left edge of the shot to hold/frame the edge of the shot.
