This specific post covers original, copyright content (e.g., paintings, drawings, etc.) and not manipulations made from other works, gifs, etc.
On Tumblr, and certainly in every other area of both the Internet and the offline world, uncredited and unsourced artwork is a huge problem.
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I’ve seen this all over the hannibal tag, fannibals reblog this to everyone
Affiliate Links & How Your Art is Being Stolen to Make Money for Someone Else
A Madness Between Two 