I see , as I've expected it is impossible to draw the QR manually. Tho based on the picture you've provided it seems that it is still on a way of painting with the printed one. Or maybe that was really the painted one being attached to the painting.
Tho overall still a very good quality painting.
You have no idea what can be drawn by hand. There were people who counterfeited banknotes by hand in the 70s and 80s. All US agencies were trying to track them down and were unsuccessful for many years. The bills were so good that they were actually better than the original ones. They were buying real bills with lower nominals, dissolving the paint to clean the paper and painting a new 100$ bill over it. You can easily make a qr code by hand, you just have to be really good at it.