Overall I like the design of Yennefer, but I feel that her face is too simple and soft looking. Maybe it's just the scene/angle/lighting we've seen her in. As for her hair I think the curls are spot on but I feel it could be a darker shade to it. The problem is that if they end up making her hair dark raven black she can't really have the super dark clothing we see her in. I feel it makes her look too bland/simple when it's a single uniform color from head to toe.
I agree. She should have a harder and irreverent face/expression. Yennefer is insolent, sarcastic, provoking and aggressive
Like this one:
Clearly, I'm not referring to her hair and skin tone, just to her appearance and attitude.