All you've done is Slapped Renders on a C4d Background. :/
Use Brushes!
Brushes are the Basis of any sig, where they be grundge, vector, lines, ect. wha ever really. They allow you to mix and match, and blend the render in.
Although, it seems you're able to mix about with c4d's a bit, which is a good sign.
So just download some Brushes and Read through some tutorials
So far, the sig Looks Nice, just could be alot better with some Brushes! ^^