if you created an original artwork, would you allow people to make money without your consent?
Or even share it?
Even though its literally called “Fanart”, where people simply want to express their love and respect to the original creator, its still considered piracy in 99% of the cases, according to the official law. The missing 1 percent is called Fair-Use, where you can use artwork from another person in a transformative way (Parody, use it in a tutorial, or reaction video…)
Most creators who see fanart on the internet close their eyes though because of a few reasons:
They understand the desire of their followers to create fanart, since they may have been in similiar situation
They see fanart as free advertising, and don’t want to risk losing their fandom
There are over 7 billion people in this world, and hunting down each one of them isn’t worth money and effort
calling the court costs money
That beeing said, not all creators are tolerant towards fanart, especially if this fanart is causing damage to their brand( eg. Fans make money or claim it as their own, original artwork, in this case you can be sure its 100% illegal)
You can publish fanart on any Artwork hosting website, like deviantart, but they do claim that they do not take responsibility for any copyright infringing artwork, meaning you will take full responsibility
If you want to be on the safer side, make always sure to always name the original author, do some research to find out if they allow fanart, if possible ask for permission (Especially if you plan on selling), and always comply to their request if they want you to take it down,or make sure it falls under fair use, then you can avoid a lawsuit.
If you want to be absolutely safe, then don’t post any fanart. Also make some research considering fanart