Next, you will completely work on the female or more feminine framed skull which is obviously a girl. Start by defining the shape of the skull and incorporate the formation of the brow, nose, upper and lower jaw and then the chin and neck. You will do this all in a single line form creating the profile of the skull's face structure. When you get that done you can begin to sketch out the eye shapes and then sketch out the entire face and expressive pose. Add all the detailing on the surface of the bone canvas creating the image of a skull.