Originally Posted by
Ptka
You have some idea of blending in the one with the bubble gum girl so I will focus on that one.
The C4D's need some work, especially the placement, you should make sure that they aren't so obvious, erase parts and blend them in too.
The colours are a bit wild, you could tone them done in some parts.
Rule of thirds: Try not to put your focal right in the middle of the canvas.
And the text could be less obvious, it's very large and pops out which isn't good for a sig like this.