looks like a good location for one of those 'blurry water' shots .
Have you tried dodging and burning the sky to liven it up a bit. You can also darken the edges of the picture by adding a vignette which draws the eye toward the focal point.
just a couple of ideas - good luck
A good solid image that is crisp, sharp and properly framed and composed - a technical success in every way. From an artistic standpoint, it is an intersting image but of less than universal appeal. A good entry into the challenge.