She looks fed up, annoyed – pissed off in the vernacular. Can we say she is brooding and feeling sorry for herself? Is that her husband? Is he studiously ignoring her? Or perhaps they are not related at all and just happen to be next to one another on the bench. Perhaps she has been waiting for someone and the someone has not appeared. Perhaps she is feeling slighted, unwanted, and is letting the world know it.
Perhaps anything – there is more we do not know than we do know about almost anyone in any photograph.