Looking good jimonions
If I could offer some suggestions, I'm not quite getting the feeling of 'vastness' from the scene and I'm a bit confused about some of the elements. I realise the fireballs are meteorites, what is the blue glowing thing in the centre? And what is the light source on the right?
If this is indeed a volcano maybe that could be represented in the background? Also the mountain range seems to kind of cut off, if that traveled further back into the distance it might help with the sense of scale. This can be done with simple mountain shaped planes rather than modelling/creating more mountains, have the planes layered and use fog to highlight each layer separately so they appear to be set apart from each other, sort of like this:
When I look at the scene currently I just see a kind of mountain bowl in the middle and it doesn't seem to be in an extensive environment. Could just be me though
One other thing I would do is maybe highlight the fact that those are trees in the foreground, I didn't notice them at first glance as they are pitch black. What you *could* do is pull the camera angle back and angle it down a bit so we see more of the trees. Then maybe make a clearing in the trees where one of the meteorites has landed, and you can use the fire from that to light up that tree section. Having the trees more visible (or at least some of them) will help add to the sense of scale that I'm missing currently.
Of course, this is just what I would try if I was working on the scene, if it's not the direction you want to take it in, this is still something decent that you have created