I came here to agree with you but then I had the good sense to read the original page which is at the Met (https://www.metmuseum.org/exhibitions/listings/2009/michelan...), and has a lot of background on this painting, including that it WAS actually painted from an existing image (https://en.wikipedia.org/wiki/The_Temptation_of_St_Anthony_(... - worth a look to compare), so my primary skepticism "how could a kid even come up with that" makes a lot more sense that he had an existing image he was copying.
I came here to agree with you but then I had the good sense to read the original page which is at the Met (https://www.metmuseum.org/exhibitions/listings/2009/michelan...), and has a lot of background on this painting, including that it WAS actually painted from an existing image (https://en.wikipedia.org/wiki/The_Temptation_of_St_Anthony_(... - worth a look to compare), so my primary skepticism "how could a kid even come up with that" makes a lot more sense that he had an existing image he was copying.
https://www.metmuseum.org/exhibitions/listings/2009/michelan...