Summary

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

It is true that there was no difficulty in obtaining some portrait taken from the life from Sebastiano: this he did with tolerable ease and promptitude, but with anything appertaining to stories or other figures, it was altogether the reverse. Nay, to tell the truth, portrait painting was the proper vocation of Sebastiano; and of this we have some evidence in the likeness of Marcantonio Colonna, which is so well done that it seems to be alive, as well as in those of Ferdinando, Marquis of Pescara, and of the Signora Yittoria Colonna, [17] which are most beautiful.
Source: Wikisource

Giorgio Vasari Lives of the Most Excellent Painters… (1850)

He likewise portrayed the Florentine Anton Francesco degli Albizzi, who was then in Rome for certain of his affairs; a work of such merit that it does not seem to be painted but living: wherefore Anton Francesco, esteeming it as he might have done some precious jewel, despatched it to his home in Florence. The head and hands of this portrait are indeed a sort of miracle, to say nothing of the admirable manner in which the artist has depicted the velvets, linings, satins, and other portions of the picture. Sebastiano did certainly surpass all others in the painting of portraits
Source: Wikisource

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