Now, I know this isn't very good as I didn't like it myself very much. :P I'd just like to see what some other people think about it.
I tried to get a good background on this, for about 2 hours and finally gave up, and put it to all black with a couple circles in it, if anyone could give me some smudging tips for a background, that'd be great, because I can't seem to get it. Also, as you can tell I like to blur things. :P
First thing I noticed is that green seems to be throwing the color scheme off.
Try not to use that much blur on your backgrounds.
If you're looking to get into smudging I suggest checking a few tutorials out on it.
There is a lot more to it than just getting a nice smudge pattern down.
You have to keep in mind that you have to blend your render in, giving it the illusion that it's part of the atmo.
I've done a bunch of smudge tags, and I'm still not that happy with my style yet.
It just takes a lot of practice and experimenting.