Custom mario

[Gors]

as OmegaKyogre said, your sprite is severely pillowed. The colors are boring and lacks contrast. You should hueshift when shading, too. Also, get rid of that colored outline, or use a black one (Make sure not to outline inside the sprite, though). The Bros' hands are too blocky, and Mario's body looks really weird.

And where's the brim on their caps?

Aside from that, you made a good attempt. Keep improving on it