~!
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.
Out of curiousity on that QR code thing, I ended up here:
https://www.youtube.com/watch?v=u99bDBYrNMgWhat an effort made not just with the painting itself but the process on making a QR to be printed on the painting.