Needs alot of work...
I Personaly would use a stock because i don't like to smudge or do anything to the background..so id say put a good scenery in the background and put that render in front then you should blend your render into the background by smudging and adding c4ds.
Also change the text and make it neat then put it in a nice place on your sig.
If you did all that ^ and looked at some tutorials the sig would look much better.
Good attempt
Edit: where the other sig go ?