When a real-world photo is used as the background for a drawing.
If the photo was altered (such as being redrawn or filtered) to the point that the photo is indistinct from the rest of the image, then do not apply this tag.
If the photo is used as a reference for character's posture, then the tag photo-referenced is applicable.
Pixiv
Twitter
Bluesky
Weibo
Lofter
Tumblr
