Very sharp. The clouds and the contrast really add to the mysterious and slightly eerie atmosphere. The repetition if highlights on the river, the middle ground, the mountain tops, and of course the clouds work well to define the contrast as well as expand the depth of the photo. Truly amazing what you did with it!
Absolutely loving the play of light on the mountains and the clouds, but for me the bottom 25% of the image lets it down a tiny bit. I'm no expert but I think it would look more dramatic if you lost a little bit of the foreground. The main feature is just so stark and inspiring. Just my humble opinion.