sorry, nothing above, i think a good portraiture, the most important element to to capture the real x-factor of the sitter. As per said, it can be an ugly person, but if you can bring out the 'glow' in the person, the instant the picture can connect to the viewer, that will make a good shot. Everyone can shoot a professional model, but if you can bring out more from the person, his/her wacky side etc that will make the shot a winner.
as a portaiture photographer, we must know how to connect to the person, to ease them and talk them out to portray their natural side and to try and whip each a personal element from them.