First sig seems really really empty besides the cool effect by the render. Also IMO this sig would benifit from a bit of text.
It also needs a light source. Your render has such strong highlights parts of his head are white. Theres no reason to not haver a lightsource when you have such a dark sig with such prominent highlights.
But you have some awesome eeffects going and your coloring is great.

The usher sig I'm not a fan of. It seems like there is just a ton of c4d's as your effects. I don't see much else. Also it needs a bit more contrast.
The pen tooling is pretty cool and I rather like the little rectangle on the right edge.

Gj but you rly should work contrast, Bg and text.