You must have seen his Morgan Freeman video where several hours of painting is condensed in to 3 minutes. It's truly breathtaking. If you haven't here it is.
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It's also been claimed that this work is fake.
It may be a fake. I'm no expert. But the video does appear to show an incredible amount of painting taking place. He's clearly a talented artist so I don't see what he has to gain by pulling the wool over our eyes.