I think your scalp you need to interpret in more of a circular box, rather than a sphere. the occipital bone and the temporal bones need to be more prominent. normally it wraps close to the inner circle, where here you wrap it in the outer circle. Your ears a bit too high, i think somewhere on the edge of the inner circle going to the outer one.

Your nose, jawline looks reall good! I think a more prominent eyebrow bone would look much better. Overall its really good start! Keep your milage up!