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Does anyone have a link to how to go about generating an image like this?

Did the writer hand make the individual polygons or generate it from an image of themselves?

It's possible to generate svgs from images, see https://jmperezperez.com/svg-placeholders/

That's really cool, but the results don't look much like her avatar. I'm guessing it's really hard to do this without a lot of human input.