One of my favorite TV shows -- sadly cancelled -- was Counterpart. If you've not seen it, it's a sci fi analogue for the Berlin wall. (and selfhood, self reflection and some other stuff)
In this show an experiment creates two different dimensions that are locked in a cold war. In one dimension the main character is an office drone and devoted husband, in the second dimension he's a Machiavellian spy who carries a deep resentment for his ex wife. Each of the two characters have to enter the other dimension and pretend to be the other. The actor was so good at controlling facial expressions and body movement that you could always tell which was which even when then two were wearing identical clothes. The office drone slumped his shoulders, he let gravity pull his wrinkled face to floor and he only sincerely smiled when he saw his wife. The spy held his head above others, he walked with a sense of purpose and he wore his contempt for others on his face. Much of the story was written on the face of the main character.
Orphan black, if you've seen that, was similar -- really helps your understand how you can tell stories with facial expressions.
SH1 had a resting scowl. When you pushed her to reveal personal information the scowl deepened to irritation and anger. She only smiled twice -- once when you mentioned night orchids and during the romantic wine scene. The next morning, after the kiss, she broke off the relationship and said it was a mistake. (which is the same thing that Viconia did, break the relationship only to start it again / break it off again / start it again)
