I like it. Have you given it a try in B&W? I'm not sure if it's possible but to try this again at a lower angle, for the whole reflection would be great. In the early morning with mist or with a more dramatic sky, you'd have a prize winner on your hands.
I love this shot. The solitude of this tree in a place a tree doesn't really belong expresses a story one wants to read. I find myself asking what happened in the flood.
I really like this picture. I agree though, if you got a lower vantage point, it would really help. I would take this one over and over with a variety of weather. Love it.
Gettong a lower viewpoint and moving the horizon to a central location will balance the composition. If there is a possibility of taking this again at sunset, do that. Do it until you get it perfect, more than than, spectactular. Don't just photograph the subject, make it yours. Make it art.