What is the difference betweenn roman imperial and Hellenistic art?

Roman imperial art is characterized by its focus on realism, grandeur, and the glorification of the emperor, often featuring detailed portraits and monumental architecture like triumphal arches and basilicas. In contrast, Hellenistic art, which emerged after the conquests of Alexander the great, emphasizes emotional expression, movement, and dramatic compositions, often depicting mythological subjects and everyday life with a more dynamic and individualistic approach. While both styles reflect their respective cultures' values, Roman art tends to convey authority and power, whereas Hellenistic art explores human experience and emotion.