This is so good that i feel like a douche for saying this but, Isn't her right foot too big? Yes I realize that is closer so it will be bigger, but even so. It looks off when compared to the other leg and the other foot.

 First of all I want to say that i love your take on these characters.

Now my criticism.

Waluigi's legs look weird, and Mario's crotch seems a little off-centered to his left.

Well that's it .

Awesome clothing shading.

 Love it, just wondering whats behind the mask. It looks like a squid man or something. He's got huge eyes or maybe he's very farsighted