Glenn, you captured a pretty sky here. I've shot many similar images, and many of them share the main issue this one faces: as a stand alone pic, it isn't that exciting. The silhouette seems a bit soft (maybe my monitor), and the prettiest part of the sky is hidden. I like your suggestion about cropping more off the bottom, which might throw more focus on the sky. This is just my opinion. If the image pleases you, that is enough!