Oh I know this one!
Wikimedia Commons, lots of images and you can search public domain if needed.
Also the Library if Congress is a really good source.
Pinterest used to be my default for reference. I've got so much of it from years past that I can still dig through it without the slop, but adding anything new is a no go.
Recently I looked for phone wallpapers, and was astounded that (at least for more abstract ones) so many of them were AI... there's only so much I can rely on my AI-senses
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Wikimedia Commons, lots of images and you can search public domain if needed.
Also the Library if Congress is a really good source.
I can't enjoy art simply anymore either, I have to scan each drawing I see to make sure it's genuine
https://bsky.app/profile/publicdomainrev.bsky.social/post/3lfandhp4cs2p