Overview
Touhou illustration (東方イラスト, Tōhō irasuto) is a tag used for fan art and other derivative works based on Touhou Project, which is a work by the doujinshi circle Team Shanghai Alice.
As mentioned above, the tag Touhou Project or Touhou is currently more functional for the same type of concept.
On the other hand, this tag is sometimes used to emphasize the fact that the work is an illustration of Touhou Project, to differentiate it in some way, or for some other meaning.
In fact, there are cases where only this tag is used without the Touhou Project or Touhou tags, so it appears that some meaning is given to this tag for each work.
On the other hand, if you give priority to fully utilizing pixiv's tag search function, and if there is no incompatibility with the intent of the work or the author's style, it is recommended to use the tags Touhou Project or Touhou or to use them together.
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Team Shanghai Alice Touhou Project Touhou Touhou Project Works Touhou Project (Derivative Work) Touhou Project Game Touhou Project Literature Touhou Music Touhou Old Works Touhou Drawing Illustration