You got a lot more to worry about than effects.
Your render totally clashes with your background..
So the first thing would be to mess with the color.
Get something in there that's relevant to the renders tone.
You need to work on blending, and a more interesting background.
Looks like an apophysis galaxy stock and that's about it..
I dunno..you just got a shit ton of things you need to polish up on,
and I don't really feel like listening to you bitch if I tell you to read.