Although I think the left side is a little bland, this sig is SICK. I love the contrast and depth of the piece and just how it flows overall. There is no text that I can see and that left side is easy to manip with a white font, so be careful. All in all, fantastic. Good luck with the SOTW!
It looks like it could've used a bit of color. Instead of 0 saturation, I think a bit of the render's body could have been a bit colorful. I like the effects, and the depth, but like the others said, I think the render is a bit weird. The way he's leaning, and the way you blended the render, it looks like his left arm is missing.