Great work Reminds me of what I use to do in my abstract days Its could do with a little more depth tho. Maybe the buttom edge needs to be a bit more sharp and have some parts wisping out into the light.
Anyway, good work man Awesome colours.
Look I got a nice idea to get this one looking better..... tell me wath you think:
you could put the planet in the other side of the nnebula, so, in the bottom left cornner would be darker and to the oppositecorner it would get brighter..... so you put all this fog in that brighter side, with the planet!
By the way, you should have to paint some plus areas....
Oh yeah, and much better without that lens EFFECT