My colors seem unbalanced/off

I've always had trouble with color theory, but with a project involving backgrounds and characters, it drove me crazy. The character on the left is exactly how I wanted it; the other two are bothering me a lot. The only thing I can't change are the colors of their "skin" (one is obviously a frog and the other one on the back It's a meerkat.)

Thanks in advance.

u/LukeIsOFF — 2 months ago