I came from a different archive site and danbooru.donmai.us sounds like am supposed to self-insert with the person in the artwork.
Pictures in first-person point-of-view.
Note that usually a body part of the person whose point of view you're at is visible, such as a penis or an arm.
If there is no other person and the character is just looking at the camera/fourth wall, use looking_at_viewer instead.