She holds a wax tablet and stylus, pausing as if thinking what to write next. Her stare is... penetrating, to say the least. Sometimes referred to as "the portrait of Sappho" in old texts.
Yes, one of her eyes is higher than the other; no, that's not a mistake. In the days before people figured out how to do proper perspective, making one eye higher than the other was an indication that the face was meant to be in partial profile. I think I like our way better.