Beauty that transcends physical presence and is rooted in the essential whatness of a person. That in seeing their face it is irrevocably connected with their being, and seeing their face draws their being so close behind that it is caught up in it, and manifests itself as one, so the beauty of a face is mentally inseparable from the beauty of the person. The distinction between physical beauty and beauty of the soul becomes meaningless, since all is one, a unity irremovable from itself.
(Note: this is not to say that if their face were to be disfigured that that would make the uglier, and their soul uglier. In fact, just the opposite, the beauty of their soul would cover over it)