Here is something that might help you
What program are you using?
SUGGESTIONS:
1)Get better fonts(found in the link above)
2)Resize your render<---if you can, it will look better
3)Add color to the background(some tutorials in the link above show you how to use your render to add matching color to the signature.)
4)Download some brushes.<---those brushes you used are kind of....meh..(The link above also has brushes

)
Thats about it. Other than that you need a border and some other stuff.Just folow some tutorials until you can hold your own.
HSM!!

(Happy Sig Making!!)