It looks like a bunch of dead trees starting to plummet to the ground. Or it looks like a volcano and overall a cataclysmic scene. But, hey that's just my interpretation. I like it, it gives you that "you wouldn't want to be anywhere near here" feel. Hehe.
Nice, but if allow me, I find the orange background too much uniform, I might have added some light background clouds or maybe a positional light. Anyway, that's your artist's choice, or maybe you couldn't do it because of distant fog?