I noticed that.
She’s no Winona Ryder (as seen at the SAG Awards Show).
Often times, when publicists and photographers think that a person looks ‘best’ from a certain angle or with a certain expression, they tend to overdo it. This results in an excess of the flat, neutral expression, because don’t you know, a smile might expose bad teeth, or lines and wrinkles, or (horror) dimples.
Can’t have any of that going on now, can we?
Personally, I think she’d be much more attractive if she looked a bit less self conscious, and more happy instead.