I love this scenery, great leading line composition with this winding curve. Your statement about the sky is right, would be nice with some detail in the sky (not a major issue, but would be just perfect then). If you shot RAW, this could be worth a try with a composite of two differently converted images, one for the sky "underexposed", and one for the foreground scenery. Or - you could shoot with a graduated ND filter to compensate for dynamic range "in-camera".