This is good work, but I agree with Syrupmasterz, the mountains aren't quite there with the rest of the piece for me. It feels like it's not quite finished...it's just a few details off from a higher rating for me. The mountains, and also I would have liked a little more detail on the moon so it looks like more than a gray disk.

But really, this is good work. The lightning looks fantastic, and the illuminating effects you have applied to it are perfect. I enjoy the simple palette you used here, it really works for this piece. I'd like to see this just a bit more polished, keep up the good work.

This is pretty good!
One suggestion I could offer would be for the mountains in the background.
Notice how the ground and grass have numerous dotted and line details on them? Adding similar rocky details would make the mountains match the rest of the image and would overall make it better. As it stands the mountains only seem to be comprised of a few different colours of grey. Throwing in some more textures would make it seem more mountain like.
Good work!