profile view

I might possibly differ with the conventional way to determine the mouth opening. Other forensic artists have told me that the opening is between the canines and bicuspids. In portrait work I rarely find a  person where the edges of the mouth don't align vertically with the inside perimeters of the two irises. With a slight smile they align with the pupils, and with large smiles they align with the outside perimeters. So I look at the over all skull structure and decide accounting for my past observations. In this case there is no difference.