She's sad
If you can read faces, you probably recognise the image above as a sad expression.
It's fake
But you probably also recognise it as fake. You can tell the subject, the actress Cate Blanchett, is not as sad as she looks.
Why is that? Is it something missing in her cheeks or eyes? Are her mouth and forehead too exaggerated? Is it because the lighting and background seem fake?
It's really hard to put your finger on it, right?
You probably don't feel sad yourself
And you could feel all sorts of ways when looking at the picture: you might feel sad (because she looks sad), you might feel admiring (of her expressive face), you might feel amused (because you feel she’s doing a pantomime).
But it's interesting that we don't feel as sad as she is shown to be—which means there is a gap between the representation of emotion in the art and the feeling of emotion in the audience.