I think a small bit of foreground interest would add tremendously to this photo's appeal...maybe pasting in a dragonfly, damselfly, craine fly, or even a floating goose-down feather would add impact. ONe summer I worked on shots like this where the foreground interest was clouds of gnats that gathered around evening time, using a 400mm lens wide open around dusk.
I did see a photograph very much like this not too long ago in a bokeh article; in that photo, the foreground was the mesh of a screen door, and the entire scene was much like your shot, out of focus water and such.