Hello,

someone has uploaded your art without credit or permission here:

however the person is set to private (with over 1000+ followers though) so you cannot see it, here is a screenshot

they claim this is their original character and their own art, which it obviously isn't; their account is full of stolen art

you can file a DMCA here: help.twitter.com/forms/dmca

simply link to the status post I gave you above and provide a link to the original picture or some other kind of proof that it's yours; it will help fight back against art thieves

I don't recommend you try to talk to them, they set themselves private to avoid having to deal with artists angry at them for the art theft