I think the problem (perhaps) is that you have two pictures in one here, and I do this a lot myself. The sky has gorgeous colors, but the misty landscape is the number one image, IMHO. My first idea of cropping was to remove the top down to just above the dark cloud. This retains the "two pictures", somewhat, however. Now I think I'd be tempted to crop down to just below the dark cloud, making a panorama with just a sliver of sky.
But, as Russ says, it's your photo. Play with it some if you want, but end up with the version you like best.
Eric
P.S. I'm happy to note that Russ isn't a doctrinaire about no cropping. If I read him correctly, he tries his very best to frame an image right in camera so no cropping is necessary. But if a crop is seen later to improve an image, he'll try it. Right on!