i love the concept, and the setup is nice. would have liked to see this a stop or two darker to save some of the detail in the highlights and deepen the colour in the sky. Slighter larger aperature would add a little depth and sharpness to it. I like what you've done with the post processing; it as an interesting ethereal glow to it.
Nice use of leading lines. Composition is too centered; try cropping off the bottom to follow the "rule of thirds". Focus is terrible; it looks like the camera focused on the clouds rather than the foreground. Sharpening won't fix poor focus; it just puts halos around the dark objects (most evident at the tops of the fence posts).