Describing Facial Expressions

[Ulysses]

I don't describe facial expressions.

If I write the scene well, the reader will see those faces anyway.

Overwriting takes energy out of the flow.

I'd only mention a facial expression, if:
1. It's typical for a character (like a twitch, or a habit)
2. If it's a reaction that is not in sync of what one would expect (deputy sees widow to inform her she's a widow, and she smiles.).