Perhaps you've seen Google's Arts & Culture app? (If not, you should get your uncultured ass to the app store because it has some pretty cool features.)
However, it's quite possible that their "Is your portrait in a museum" function is not one of them.
For starters, let's examine my results:
OK Google, this isn't even a painting. This is a photo of a woman standing in an art gallery.
Well this this one is in fact a painting.
Honestly, I'm not sure if I'm being shaded, or if I should grow a beard.
Overall, my best match was probably this young boy who popped up when I switched angles.
Let's go to social media to see how other people fared, shall we?
UN-FUCKING-CANNY.
This one is actually art all by itself.
Wait, did she actually sit for this painting?
And of course, some people just want to see the world burn.
But others did actually get some accurate-ish results!
Fine, I'll give you this one, Google.
Fluke.
My faves, of course, are the people who mocked up their own results.
Sorry, can't stop laughing. Desperately hope that painting is really in the app.