make the asteroids and the planet behind have a light tint of green
Ahh I see someone's used the photoshop cloud filter That filter is great, but sometimes it's a bit obvious when used in large areas. I think maybe you should add in some stars? Or a bit more white/black, depending on the sort of mood you're going for. But hey, I haven't done or seen a lot of space art so I'm not entirely sure what it's MEANT to really look like I do like it though!
Nice! The atmospheric clouds to the left and right gives a surrealistic feeling to it (unsure if that's the point...)