sigs ^^

First one almost has a feel of being over contrasted without actually being over contrasted. I starred at it for a while trying to figure it out, but the render in the first one blends a little to much with the background and i kinda loose him in the background.

The render in the second sig seems like you pasted it on a background and just colored and shaded it a little, idk it has good flow, but i think the render doesn't blend enough.