Schedule E ["final answer."] - Because you do not consider your photography a business.
Both of the answers you referenced actually say pretty much the same thing:
"Any royalties from intellectual property you created as part of your profession should be reported on a Schedule C. If this royalty is not from an activity you engage in professionally, you should enter it on a Schedule E."
"Royalty
income from your business, including artist royalties, go to a Schedule C, although other
types of royalties, for property, do go to a Schedule E."
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