On twitter, you must be on the lookout for any MLP you may submit anywhere, the user thief known as "mlp_june" ( link is here https://twitter.com/mlp_June ) along wit her other accounts mlp_valentine and mlp_anya. She comes to DA and everywhere else and grabs ANY line art or people do it for her, then she colors it (quite poorly) to make "new characters".
She doesn't even ask permission either, she believes by putting the source (which she doesnt even do many times) the original artist will be OK with her ALTERING their work.
Hell, she just made an alteration of John Joseco's pretty princess Luna in mucus green. Just check her first account for proof.