Use some adjustment layers on that sig to blend the c4d.

Have a look at my starlight tut i explain in there a way of blending c4d's using brush tool.


Basically your c4d sticks out like a cock in a nunnery because the colour completely contrasts the rest of the colours in the sig try to change the colours of the stock and the c4d so they looks sorta similar. Adjustments are the way to do this.