Possibly not anything you can do about it but I suspect the reason that #6 appeals, not to me because of its harsh lighting, that is for a man, but it answers my concern with the rest. She has a large round face and you have done nothing to make it smaller in the first five. By positioning your light with the camera flash to give a soft balance to light just part /side of the face, else the fall of her hair to do the same .... as but not so extreme as in #6.
I hope she is willing to give you another session to try these ideas
I'm a fat chubby guy and this is a self portrait I did back in 1953 and so I tried to make my face narrower, way back my girlfreind also round faced used the only 'make-up' available to her [ shoe polish ] to do the same which when she went home caused her Mother to warn her about photographers
[ A girl had gone missing shortly before supposedly in connection with a photographer ].
edit ....Better than a photo of me
this portrait shows what I mean
I make no claims to knowing much about portraiture and probably have done no more than half a dozen sessions in my life.