Nice thumbnail. It's pretty simplistic, but I like the little hints of architecture and human occupation. consider making the glass dome though of the canopy a bit more rounded or sharp. Right now it's sort of in between and comes across as a bit unnatural. (I'm talking about where the dome meets the building, not where the dome meets the sky/background.) You could also use a little more fog/atmosphere/light from the crevice between the foreground pointed stone and the lower stone background that the building is built on top of, to give it a further depth.
I absolutely love your rocks though! And the whole composition, although simple, carries with it everything it needs. You'll do fine here