Head of Caracalla, c. 1768. As part of their training in the late 18th century, French artists practiced drawing t?tes dexpression, or expressive heads, that display subtleties of human emotion. Greuze made this chalk study in preparation for a painting in which the Roman emperor Septimius Severus rebukes his notoriously ruthless son, Caracalla, for attempting to assassinate him. Although Greuze based this face for the figure of Caracalla on a Roman portrait bust, he imaginatively adapted the facial expression to dramatize Caracalla?s resentment and humiliation during the confrontation.