works in a long time. I can't seem to find what's wrong in them.
C&C is appreciated.

Oshi the last one is geat, lacks a bit of depth imo.

i impress in this,good editng,detail,nice chosee color

9/10

1st one:
Good job with blending but the random blue spots on the hair looks stupid also you should keep the lighting at one side ex. Bottom or Top not both

2nd one:
Pretty boring imo.
The render doesnt blend with the bg at all and the render is lq
The lighting is a bit too strong
And get rid of the border

3rd one:
Great job with blending but you need to work on flow
The flow looked good except at the bottom right corner it looks messy
You also chose a bad spot for lighting

4th
If your going to smudge the bg smudge the edges of the render so it can blend *facepalm
Very messy signature you cant even tell what the renders are doing
Add depth and better lighting and get rid of the border

thanks. really liked this c&c. I'll think about it more when i do my next sigs.