As you search through the various art assets, star everything you think you might want to use, then periodically go through and clean up the tags so they make sense to you. I have searched "clown" and found demons, when you need a demon, and who doesn't once in a while, you will not remember to search "clown" so the tags really help. Some images are tagged with the entrie english language and some are tagged rather esoterically, your library is tagged as you want it.