Nice little sketch you got here Maybe you should consider drawing on non ruled notebook paper. It makes me think a little of the prison pictures you tae from the side and the front. She only needs the sign. Sorry if I sound cruel, that is not my intention
What I like about this sketch is the hair, which looks very much like it's made of, well, hair! With the three-quarters view and the profile right next to each other like this, I notice that the mouth is very low on the profile view, so that character ends up looking like she has no chin at all.
Lovely little sketch, but I agree the eyes on the left girl seem off, one pupil looks a lot darker and the spacing seems off. I don't follow this sort of style much but I personally feel she could use more of a nose too