Authoring, ie portrayed characters and their surroundings do not belong to any product (anime, movie, game), and is entirely an invention of the artist. single:
Images depicting only one character.
No one else should be visible in the picture. short hair:
Hair no longer than shoulder length. zettai ryouiki:
"Zettai Ryouiki" ("Absolute Territory" in English) describes the area of uncovered thigh between the skirt and the stockings. The presence of zettai ryouiki requires socks that go above the knees. The golden ratio for the ultimate zettai ryouiki is 4:1:2.5 (length of skirt : zettai ryouiki : length of socks above knee) and the acceptable margin for error is ±25％.