Danbooru-based image board with a specialization in high-quality images.
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areola bra breast_hold hisasi jpeg_artifacts nakiri_erina pantsu panty_pull see_through seifuku shirt_lift shokugeki_no_soma thighhighs underboob wet wet_clothes

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practically any image sourced from twitter should include the jpeg_artifacts tag
Yep. They use q=85 in addition to 4:2:0 subsampling