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I have honestly never seen an image submitted to HN.

• mtmail 5y ago
  In comments it's very rare because and it's not rendered on the website. Usually screenshots, e.g. to show that an article isn't readable on a mobile device. As direct submission I see 1-2 per week, e.g. the XKCD comics, though I can't remember any getting any traction or making it to the frontpage.