Where the field disagrees · creative
Where a good portrait actually ends
The portrait succeeds when it reaches aesthetic/artistic quality (“Picture Perfect Posing Practicing the Art of Posing for Photographers and Models (Voices That Matter)”, “Picture Perfect Lighting An Innovative Lighting System for Photographing People”), judged by the image itself
The portrait succeeds only when it reaches subject/client satisfaction (“Photographing Women Posing, Lighting, and Shooting Techniques for Portrait and Fashion Photography”) or, further, commercial/business performance (“Professional Portrait Posing (Photo Pro Workshop)”, “Doug Box's Guide to Posing for Portrait Photographers”)
What turns on it · Your definition of success determines what you optimize during a shoot and how you measure whether you did well.
Drawn from The Bicycle Guide to Photograph People Well — read it free, in full.