Margery Williams Bianco

Generally, by the time you are Real, most of your hair has been loved off, and your eyes drop out and you get loose in the joints and very shabby. But these things don't matter at all, because once you are Real you can't be ugly, except to people who don't understand.

You become. It takes a long time. That’s why it doesn’t happen often to people who break easily, or have sharp edges, or who have to be carefully kept. Generally, by the time you are Real, most of your hair has been loved off, and your eyes drop out and you get loose in your joints and very shabby.
But these things don’t matter at all, because once you are Real you can’t be ugly, except to people who don’t understand.

He didn't mind how he looked to other people, because the nursery magic had made him Real, and when you are Real shabbiness doesn't matter.

Once you are real you can't become unreal again. It lasts for always.