It's funny you say that, because when Vaneta interviewed Pia for Newsarama a few weeks ago, Pia criticized her own work thinking she didn't make the faces distinctive enough, and she was worried that people might get characters (I think she mentioned Natalya and Beth 2) confused now that they're starting to appear in the same scenes together.

But I don't think she has anything to worry about. She's done a good job of making sure each character has something visually distinctive about them, and BKV has really developed each character so well that as soon as she spoke one word, there is no question which character is speaking.