EDIT: OK, I'm going to be more clear here: JPEG artifacts. Lots and lots of them. Eye-blurringly so.
This one needs to be canned. Reupload the one from Pixiv.
What the Hell are you talking about? Are you looking at the image wrong or something? There are no jpeg artifacts, plus this and the pixiv one are exactly the same: they're both 440.32 KB (450883 bytes) in size. I even zoomed in entirely and cannot see any artifacting.
I see no visible difference with the naked eye. Are you sure you aren't confusing this version with the one that was up earlier? This one doesn't have the same tag history as the earlier version, which seems to have been erased from the site completely.