The way her upper lip extends to the edge of her face keeps bugging me, but I don't know the character and her look is totally your call! Aside from that, I love the details like the translucency of her hat and the coffee cup stains. And all the other parts, too.
Is it just me, or does this character look like Bunchh from Wendy Pini's "Masque Of The Red Death" comic?? I could totally see Bunchh in that kind of an outfit, and the blue skin adds to the whole look!