A great portrait is always more a portrait of the painter than of the painted.
 Samuel Butler, The Note-Books of Samuel Butler (1912). copy citation

Context

“If he has made it clear that he was trying to do what we like, and meant what we should like him to have meant, it is enough; but if the work does not attract us to the workman, neither does it attract us to itself. Portraits A great portrait is always more a portrait of the painter than of the painted. When we look at a portrait by Holbein or Rembrandt it is of Holbein or Rembrandt that we think more than of the subject of their picture. Even a portrait of Shakespeare by Holbein or Rembrandt could tell us very little about Shakespeare.” source