Now, as promised, here are the second set of pictures which emphasize the sky. Now all these are from the great state of Alaska, and each highlights the sky in its own way. Now, in the first picture the sky is a bit more of a passive entity, that frames and accentuates the scene below. In the second picture, the sky is the obvious center of the picture, with the mountains and ocean adding background. In the third one, the sky and other elements are equally important. In the final photo, done in B&W, the sky is again the commanding force.
As an aside, let me know if you'd like more or less commentary on the pictures. I personally feel that sometimes I say too much.