What are the masterpieces of China's ancient paintings and calligraphy?

Wang Xizhi: Preface to Lanting Collection, Sunny Post in Fast Snow and Seventeen Posts. Painter's masterpiece: Gu Kaizhi: a painting of the goddess Love, a woman's history. Zhan Ziqian: You Chuntu. Yan: Portraits of emperors in past dynasties. Wu Daozi: The heavenly king sent a picture. Kai Liang: The heavenly king sent a picture.