The meteor looks really good. I'd just drop the grayishness on the front, thats wher it should be the lightest/most saturated(i guess).
Considering how close that flaming meteor is to that guy, the ground, and that tree, everything should be a lot lighter. The guy should be very lit up, with relatively dark shadows, same with the tree. Then the ground should be lighter around them.
And is it night time? if so, the mountains should be much darker, and no matter white time, they should be less saturated because they are so far away.
Keep working at it, I think this will be really cool.