While I agree that a larger head would probably make her look more “normal/realistic”, I’d have to say that I feel a large part of her appeal is her unusual build. She looks really tall and delicately elegant and in that way beautifully unique. Personally, I’d stick with the proportions you currently have. She almost seems like a very human-like alien or a genetically engineered human or something like that and has a lot of appeal that way. Just my 2 cents. 
I’d probably pull out her ears a wee bit more to the sides, though to widen her head a little that way. I’d say she looks a bit “compressed”.
Anyways great work! I’m really enjoying watching your progress.
Cheers!