User blog comment:Nep-Nep/Sei Shōnagon/@comment-32398851-20190404100707/@comment-24978536-20190407003838

Nice, that's a great find. Comparing the art, I'd definitely say it's Tamagonokimi. Thanks, I'll credit the artist now (though just in case, I'll add a "possibly" to Shōnagon's page).