I made a vertical signature 3 weeks ago, I actually forgot to post it here to see your CnC.
CnC
Looks awesome.
If i could change anything,i'd make the body a little more visible.
Other than that: 10/10.
Hard to see the character and the bright lights in the top right are extremely distracting, maybe die it down like you did to the blue in the bottom right... i still can not see the render's arm at all in this image...
Overall: 9/10. Outstanding.
Looks great I agree that the colors could use some working on. If you can adding a sense of texture to the body would be great too. Other than that there ins't much to fix but I feel that the sig might be too big lol...
The bottom of the sig is like you really cutted his legs. That part should be solved if you know what I mean.
Also MAYBE popping out the render a bit might be an option, but as it is, it integrats prefectly with the background.
Overall 9.5/10 (fix legs and 10/10)
I can see where his legs cut off.
The contrast is waaaayyyyy too strong, and the shadows are waaaay too flat. Pretty much lost all of the detail in the shadows and midtones.