Hi there! This is a very beautiful and dramatic photo.
Composition wise, I love the different shapes of the clouds and the way the light pours out from an opening between the clouds. Clouds have a way of enthralling people. It is no different here. I love how the black contour of the landscape offers a nice contrast to the sky. Though, according to my opinion, the bottom part can be cropped a bit since it is not adding anything to the photo.
Technique wise, I really like clarity of the photo. The title of the photo is appropriate.
Beautiful. I like the strong contrasts - the sharp line of the horizon/terrain with the softness of the clouds is lovely.
The only thing I could critique this is perhaps more a hopeful suggestion than anything. This looks like it would have done well as a long desktop background instead. Such as a panorama shot, with a bit more showing on each side.
There are some free programs out there that you can use to stitch other images together. This would let you bypass your camera's picture-taking dimensions and give you much more freedom with your picture dimensions.