Good comic, but the tits aren't canon. Kim is supposed to have small-ish pointy breasts. Bonnie and Shego have larger, round breasts.
Also, the comic shows all their nipples appear identical except for color. I know you don't see their nipples in the show but people (especially women) usually have different nipple shape/size, just like hairstyle or facial features differ between people. This maybe just a nitpick, but just a bit of attention to detail that can suggest more care/consideration went into the art and character design. Otherwise these girls just look like the same character but color palette and hair is switched out, considering they have the same body-type and facial features and aren't wearing clothes.