Storm Front in the Eastern Sierras

I think this a very good image.

However, an adjustment or two would make it great.

The first thing to do, in my opinion, is to move the highlighted cloud (the main focus point)

to somewhere other than right slap-bang in the middle of the picture.

This could be achieved by cropping the far right quarter out, as this is not adding much to the image anyway.

The other thing that I think would help is if you cropped a bit off both the top, and the bottom, in order to make the image more of a letterbox look.

I hope my comments have both been constructive, and useful!