This is not the actual artist FYI, they have simply mirrored the original image. Its plagiarism, I'll tag it derivate work for now.

Aneroph_Q said:

This is not the actual artist FYI, they have simply mirrored the original image. Its plagiarism, I'll tag it derivate work for now.

Thanks for pointing that out! I went and reported the pixiv user who's been posting the mirrored art.

No problem. They posted two other works (one of which was post #5439223) which I recognized so I checked this one as well. Your reporting worked, looks like their account's already gone.