It isn't an original work, but actually a painted version of a famous engraving by Martin Schongauer.
https://en.wikipedia.org/wiki/The_Temptation_of_St_Anthony_(...
https://en.wikipedia.org/wiki/The_Temptation_of_St_Anthony_(...
"pentimenti, or correction marks, a common indication that “a painting is not a copy, but an original work created with artistic freedom.”"
How often are they analyzing copies made by 12 year old. Is a 12 year old more likely to have made errors or drifted from the source during the process of the copy? Could the corrections be attempts to bring the painting closer to its source, because it wasnt close enough?
The remarkable thing about the early painting/symphonies isn't the absolute quality of the work, it's that they showcase the artists' intrinsic baseline talents, which they would then leverage as their skills improved with maturity to become some of the greatest artists of all time.