That is my art comment how can i do better

Hmm depends on what you wanna change. But things I reccomend is get some reference or a quick sketch of the body (like for example stickman) so you can see the anatomy better.

As for coloring, you can try using kinda darker colors, or you can find some already existing color pallets. It makes it good to look at when it doent have too much bright colors.

Also if you want, you can try to shade it. I reccomend to shade drawings with slightly darker colors instead of black, but you can do what is more comfortable for you ^^

Now this is quite long list of things you can try. But anyways I really liked the art! Good job :D

Azzy’s mouth lookin a little weird. (Still is good art)

using slightly less saturated colors and getting some references might help you a lot :) <3

It doesn't look like betty to me. Nor does frisk.

you can shade it by using "clipping" in IbispaintX (so when you shade color it won't be messy)