Lynn Cullen said this quote

To say that he 'nailed a subject's soul to the canvas' makes the assumption that we persons, as well as artists, can see one another's souls.Maybe we do. Maybe we all have the ability to perceive another's soul, and do so every day, only we take it for granted, and don't even know it when we're doing it. We call it knowing someone's 'character' or 'personality.