I think the strongest element in this shot is the parallel of rerflected shapes in the water and the line of the trees - you could perhaps have afforded to darken the thing more, which might have allowed more detail (and therefore interest) in the sky.
If the sky is blank like that, I'd suggest waiting until the last light or early morning glow, or for cumulus clouds to help. Otherwise, just cut it out.
Due to the overcast sky, it really over powers everything else. I would have cropped it down to just include the water, as I find that the most attractive part of the photo =)