If you visit all the online drawing websites, people do this all the time and much faster. The Scarlett painting is sped up quite a bit. It's even more amazing to see in real-time.
There are thousands of artists out there that can easily replicate this with their computer and Wacom tablet. Computers are great because it's easier to fix mistakes and generally get a good feeling for the shape and then you fill in the details.
Not that I'm any good mind you, but I have seen a lot of great ones happen in realtime. It's just much easier on computer, you can go back and change something right away, move something with copy/paste. Heck, even trace off a real photograph on your tablet. What's amazing is that he is accomplishing this only with photoshop which honestly sucks with direct raw painting versus photo editing.
The one using MS Paint is hilarious
http://www.youtube.com/watch?v=kBLfu...elated&search=