A portrait does not compete with a photograph, although I think it should be primarily objective. That is to say it should tell you more about the sitter than the artist. The good portrait has movement in repose and is a subtle amalgam of varying aspects of the sitter. It has mobility, and a synthesis of vision which is denied to the camera.
– William Edwin Pidgeon, 31 Aug 1962
[Answered in response to a request for his definition of a portrait by Sheila Patrick of Vogue magazine]