https://twitter.com/Chayason8 is confirmed to be a blatant tracer of artwork. All of their art is shameless, zero effort tracework that comes from all kinds of artists. Report at will and keep an eye out to see if any of your commissions/artwork are in his gallery of shame.
Whatever you do, do not post 'proof' showing pornography or explicit content! There's strong evidence/suspicion that this person is a minor and has no business being in the adult community to begin with, let alone create content for it! To avoid any backlash from you 'providing explicit content to a minor' or whatever, it's better just to report it through Twitter and take care of it then and there.