I don't touch it again. It's not pedantic. The nose isn't a copy of the person's nose - it's an impression, an expression of the nose. The eyes are not a copy of the eyes - they are an impression, expression of the eyes. The portrait is alive - it is that person.
Pedantic portraits are dull.
It takes a courageous client to accept a portrait that is alive. That is why there is so often controversy over painters' and sculptors' portraits. Yes, in a way. It's pointless making an otter, say, showing every eyelash and toenail - they are already there on the real thing. If you do that, then, though it looks like the real thing, it is dead because it cannot move.