I just got married. For the event I have decided to get a 3d print done of the both of us(6 inches wide). So here it is, 3d scanning by 3d2go and then assembled/retweaked by me. What I've found is scans don't do all the work for you, much of the smaller forms not facing the camera don't get caught especially underneath the face and along the sides. Likeness can also be lost when you are not careful in assembling and cleaning the separate parts, and often don't get totally caught. So all you likeness sculptors need not worry, your job is irreplaceable.