This would be a completely new kind of tag. It would be applied to the artist name. The purpose is to mark an artist which commonly has a specialized theme. Examples: foot focus \ perfect feet \ bondage \ bdsm \ huge breasts etc. It would not include ordinary terms: looking at viewer \ breasts \ 1girl or a certain character. Quite often an artists work is not completely tagged and may be missed in a search.
Requirements: Artist should have at least a couple hundred works. At least a quarter should be in the specified tag or pool (whether they have actually been tagged that way or not).
The purpose is to not overlook ones which are missing a tag. Person would know to check out the rest of artists work.