|Don't do it!|
Edit: Since posting this, the Etsy store owner has claimed to have removed all of the fan art in their store they claimed they "found" in a "design package" on Fiverr. A friend of mine has gone through and found the shirts buried in pages and pages of awful "I <3 ____" shirts, traced back the art to the DA pages, and is in the process of reporting them. If you find yours, please follow the DMCA instructions on Etsy.com.
So a nice fellow TMNT fan who shall remain nameless linked me to an Etsy store (JBennettCreations) that was selling my drawing of Dr-Innocentchild's femme TMNT on a shirt.
I filed a DMCA with Etsy and asked the store owner to remove the shirt, but now the store owner is attempting to take retaliatory action against me by threatening to report me to Nickelodeon for copyright infringement, regardless of the fact that Nickelodeon has always been generous to the fan community with regards to fan art. So we'll see what happens.
I have noticed that there are a number of other shirts there with stolen fan art on them, most notably this drawing of Groot and Rocket by Aktheneroth:
As well as a number of other shirts with fan art I don't recognize that has also likely been stolen, as well. (Aktheneroth's art can be purchased from his Society Six store here: society6.com/hobosapien/rocket…
Please feel free to review the store and let any artists whose art that you recognize know that their art is probably being sold without their permission on t-shirts in this store. Please ask them to also file a DMCA takedown notice with email@example.com. A notice can be found and used as listed on this helpful website dealing with stolen art and how to have it removed from Etsy stores:
Good luck and happy hunting, guys!