A reconstruction of Leonardo's head

Here is a fascinating follow-up to an intriguing short #TED talk in which, as a result of an ingenious process of elimination, the self-portrait of Leonardo da Vinci as a young man was revealed. You can watch the talk here. The speaker was brilliant portrait painter Siegfried Woldhek. Here's the note he sent me this week.  (click on 'full-sceen' for best viewing)