Estranged ©.

To help Ryan Gosling stay in character, the real doll was treated like an actual person, as is done by the characters in the movie.
She was dressed privately in her own trailer and was only present for scenes that she was in.
The real doll had 9 different faces which were used to show a sort of evolution of the character.
The doll starts with a face with heavy make-up, but then later uses a more natural looking face without make-up.
Finally, the doll's face becomes slightly green to reflect her "failing health".