Artist Use vs. Copyright
The fantabulous Art Sherpa and Stunt Hands just uploaded a live stream that they did earlier in the day. The topic is on copyright and artist use, infringement, and some of the questions that people might have. I suggest that every artist watch this video.
I have been impressed by the Art Sherpa in the past because she directly addresses the things that people need to know. This video is a fantastic starting point for any new artist like myself. However, it only covers the current laws in the United States, so if you live abroad you'll need to research your local laws.