Are you charging for art such as the examples above? 
Because if you are, you are not allowed as you are using episode assets and making money from them. Episode owns the rights to their characters and so on, therefore you can’t make money from making covers using episode characters, traced or edited.
You can take commissions for art drawn in your own style, but these can’t resemble what an episode character (ink or limelight) looks like as it is plagiarism.
You can’t sell art with episode characters in it, if that is what your commissions are based of, you will have to shut down, sorry if I’m mistaken 