I kind of don't like how DA does their critique system, but I'll give it a shot. c:
The contrasting darks and lights you've got in this composition are VERY effective. An audience typically likes the contrasts, and it gives the viewer's eye a chance to start and finish in a very precise manner. He may be drawn to the light gap in the sky, and then down to the mountains, across to the bottom right hand corner, around the border, into the darkness. And I love that, a very natural flow, to me. c:
I know this was a quickie, and I'm very impressed at how well you can do something like this as a fast-paced digital painting. xD There's only a very select things I would nitpick at, since you're looking for critique.
The mountain that is most lit--the grown below it almost semi-confuses me. I know it is ground, and I know it is below that specific mountain formation, but that ground seems to "run" into the formation that is closest to the view. It's a fancy optical illusion when mastered, but right now I think it's just a tad confusing. Easy fix though, just defining whether you want the ground to be separate or together with the closest mountain formation would clean that up. C:
At the leftmost formation (and what I would assume would be the formation that is farthest from the viewer) seems to have too abrupt of a stop, which takes away from the dimensionality of the composition. In other words, it almost looks too flat. But I also think that's just a personal opinion matter. xD I feel like if it were just blended into the sky a tiny bit more, it would have that illusion of being further in the distance, creating that dynamic dimension.
This is really good, I thought it was a traditional painting at first! I love the texture and lighting of the rocks and sky. You did a great job establishing an ominous mood. The only thing that you could change is the rocks in the foreground. I know that they are in shadows, but maybe you could add highlights to their edges or something to make them pop more and show that they are a lot closer in the foreground. Since they are in shadow and are basically the same color as the colors behind it, they blend into the background.