Err yes Bill, that could be a good starting point.
I think that's the goal of an ID photo - making sure the person is recognizable. ID photos are a subspecies of portrait, but I don't think a Portrait (with a capital P) has the same goals as an ID photo. A capital-P Portrait is as much about the photographer/portraitist as it is about the subject - it's an expression of the creator's perception of the subject, or at least some aspect of the subjects' persona that resonates with the creator. It doesn't have to be accurate to be "true".