There are several ways to indicate the angle at which a person is depicted in the visual arts: en profil/in profile, en trois quarts, frontal. While these all generally relate to portraits, I wonder if there is a term for seeing a person from the back.
In video games there is the term 'third person', but while this term AFAIK is gaining ground in the film world, this has more to do with the position of a camera in relation to a person we identify with than with one we are watching as someone else (or empathize with).
Hammershøi famously depicted people this way in his still interiors, influenced by Vermeer and Ter Borgh:
This painting is titled 'Interior with Young Woman seen from the Back', but I wonder if there is a more technical term.