Gianfrancesco Penni
Born in Florence to a family of weavers, Penni entered Raphael's workshop very early in his life, and collaborated with him on several works, including the famous Rooms of the Vatican Palace, as well as the frescoes of Villa Farnesina, both in Rome. Heinrich Wölfflin and some other writers credited him with the entire execution of the Raphael Cartoons, with Raphael only creating the initial design, though more recent writers believe Raphael did much of the work himself.
Three Graces (Raphael)
The Three Graces is an oil painting by Italian painter Raphael, housed in the Musée Condé of Chantilly, France. The date of origin has not been positively determined, though it seems to have been painted at some point after his arrival to study with Pietro Perugino in about 1500, possibly 1503-1505. According to James Patrick in 2007's "Renaissance and Reformation", the painting represents the first time that Raphael had depicted the nude female form in front and back views.