Fictional Fans

Depending on your legal jurisdiction, and the jurisdictions of the place you are posting, there may be more or less provision for what qualifies as a fair use of another person's work. Selecting maybe a representative image or two so people have an idea of what they are getting in to, attribution, and links to the original sources, if still available, are best practices so that a work doesn't get decoupled from its creator.

Some people use Creative Commons or other schemes to say how other people can use their work, and if that's the case, then follow the scheme and you are doing what they would like you to do with it.