So, for Rogue One they were lucky enough to have a sculpt of Peter Cushing's face from the movie Top Secret, but clearly for Carrie Fisher they had to model the face from the footage in the movies. So I was goofing around and I made this:
They parts on their own are pretty good (nose, eyes, chin, lips) but the overall proportion seems off. Besides, they clearly got an actress with smaller shoulders so with the Leia hair she looks like she has a huge head.