It is a lovely piece but i cant help but feel that her head is quite large.
With the way her head is facing the bulk of the back of her cranium should be facing away so there wouldnt be that much volume to her hair and since you can tell that it isint teased or anything that it should fall closer to her neck. So shaving down the hair line and showing a reverse "S" curve to elude that the neck is under there would work imo.
Her mouth is to low i believe and i think it would be at an angle like ^ but not as extreme and softened.
The head/hairband seems unrealistic to me.
good work and id love to see the finished product.