1. During the Renaissance, there were two main types of portraiture: collective portraits depicting groups of people, and independent portraits focused on a single individual.
2. Leonardo da Vinci was influential in developing techniques like sfumato and chiaroscuro that gave portraits a sense of naturalism and psychology. His Mona Lisa set new standards.
3. Raphael was deeply influenced by Leonardo's innovations and adopted techniques like pyramidal composition and subtle background treatment in his own portraits of Agnolo and Maddalena Doni commissioned in 1506.