First Signature: Theres no blending here, the render doesn't suit the background at all. The render some main colours, blue, red and slight bit of orange, the rest is just shadow on the render. Yet your background has none of these colours, exept a slight bit of orange, so it doesn't blend at all. I would suggest maybe some smuding of the render, put all over the background and set it to overlay, and try get some of these colours in the background for a better blend. I would also get rid of the cross hatch pattern because it isnt complimenting the signature at all. Some C4D's set to lighten and screen on top of the render would be nice also, just to cover up some bits of the render. Text can't suit the signature while you have that background. The background is just horrible imo, thats all i will say.
Second Sig: This just looks like a motion blur of the render, set behind the render, and a cross hatch pattern on top of it all, and then some awful text. I would suggest some brushing possibly, and just a lot more detail to make this signature more interesting, a better text font would be good also. C4D's, brushing, and some effects are needed and a lot of them to make this sig look 1/2 decent. In my opinion anyway.
He Who Dares Wins And i'll die to win, cause i'm born to lose Fucking Civilian