The anatomy of the figures is really distracting.. maybe they are not supposed to be human, but they have otherwise human features. The character on the right, his ear is way up high on his skull. The purple figure.. I think you brought his lip up to show contempt, but there are lots of other nuances to expression you can use. Right now it looks like that is the structure of his head and itโs odd. The heavy line weight you are using makes it hard to distinguish form from shadow.
I would study different expressions and head constructions to help build the characters. I agree with the others, I like the palette.