I would first wonder if there is enough compelling interest in the sky to really make the image the way it is shot. The color is nice, but it is still a bit underwhelming. Not because it isn't nice, just because competition in the viewer's experience is wwith a lot of great skies.
That said, the composition could be improved some, in my opinion:
1. There is a lot off boring dark space on the left--crop in to focus on the color and the hills more.
2. I think it could also stand a bit more red saturation, if you are not opposed to that kind of thing.