It occurred to me while working with HeadShot v2 that one or several sliders that may be useful is to add a slider to adjust the shape of the head (skull)/face seen from above. Some people have egg shape, narrow up front and wide in back, while others are long and narrow front to back, others yet are oval shaped.
In addition, besides including the neck and wrinkles, add "waddle" sliders for older adult avatars. These will help tremendously.