I did a number of the soft sculpted dolls in the 80's. You need a long slender needle and begin and end your stitches through the back of the head so the tie offs will be covered by the hair.
Another hint, stuff the head very tightly then secure with a small rubber band. Now go back and tie it off with floss or heavy duty thread then remove the rubber band. This gives you a much tighter ball.
If you are worried, you could practice on muslin circles but don't worry. It is your vision and stitches can be pulled out and redone until you have the face you are happy with.
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