I definitely dig. Advanced critique? Hmmm...I guess the only thing would be to push back the character on the right. So she doesnt blend with the character in the foreground. Or maybe just remove her white outline.
First off, luv the names of the characters. They're a perfect match to the cool designs. Whether drawing heroes or villains, they all have a certain fun bounce to them. Looking at new cheeks art is always a guaranteed smile.