Splendid sculpture of the Two Slaves by Michelangelo ; Leonardo da Vinci 's fabled Mona Lisa ( La Joconde ) , but also his sublime Virgin of the Rocks ; Titian 's voluptuous Woman at her Toilet ; the poignant Old Man and His Grandson by Ghirlandaio .
Michalangelo heavily preferred painting to drawing , and never once created a sculpture of any sort .