The last one wasn't a render and a background!!
Stop saying that
To be honest, yes it was. You just had some mismatched colors as a gradient and brushed splatter and added a render on top of it. It lacked depth, lighting and flow. Basically those are the 3 biggest requirements to a good signature. This one looks like a black background with color mismatched fractals in the background a big render a smaller render with low opacity and some text with halo font.
One thing about being a beginner in GFX, If you can't take insults about your work, don't GFX. There are haters and haters will hate. Also some people are just trying to help. Don't expect your first 5 signatures to be amazing.
isnt this a deja-vu of your last splatter background signature ? man u need to read tutorials start there : Sig Tutorials - Starting
it will help u alot ....
plus u dont have depth at all in there .. depth is basically the distance difference on objects like dimensions , blurriness , lighting effects .