Ummm a lot of characters faces look off, Marth and ZSS face looks off, hell ZSS didn't have a mouth.
Goku's lip line looks like its about to fall off.
To me, it seems Peach doesn't have a nose, which I am okay with since its hard to get most features of a character when you are using sprites.
Also you are using the wrong artwork design, she is based on her smash 4 appearance.