User blog comment:Chibiacnologia666/Newcomer here/@comment-21119641-20180226154823

Basically, you're capable of using most images for your characters (with the exception of real life or extreme CGI ones), including from other animes (as many of us do here), as long as you don't CLAIM them as your OWN.

Also, if you want to use an artist's original picture, you ought to ask them out for permission. If you don't know who the artist is, it's best for you to state in the "Trivia" section that this image was done by someone else.

Is this what you meant? I'm sorry if not, it'd be best for you to clarify it.