How did the artist put the QR code on the painting? Did he also painted that one out? That interest me a lot since that is not a digital product or a printed one.

Anyways going  back to the topic. Most people who are coming to bitcoin are just looking for easy money scheme without even realizing that they can really used their skills and get paid easily by doing such thing.  That is why I always do tell the newbies to learn some sort of skills like arts such as this one.

I have here my  examples

https://bitcointalk.org/index.php?topic=2488260.msg43315155#msg43315155