Chap. CXXXIX.—Of Variety of Faces.
The Italian painters have been accused of a common fault, that is, of introducing into their compositions the faces, and even the whole figures, of Roman emperors, which they take from the antique. To avoid such an error, let no repetition take place, either in parts, or the whole of a figure; nor let there be even the same face in another composition: and the more the figures are contrasted, viz. the deformed opposed to the beautiful, the old to the young, the strong to the feeble, the more the picture will please and be admired. These different characters, contrasted with each other, will increase the beauty of the whole.
It frequently happens that a painter, while he is composing, will use any little sketch or scrap of drawing he has by him, and endeavour to make it serve his purpose; but this is extremely injudicious, because he may very often find that the members he has drawn have not the motion suited to what he means to express; and after he has adopted, accurately drawn, and even well finished them, he will be loth to rub out and change them for others.