I entered the prompt like this
Girls playing in an arcade, a scene with black arcade game machines, four people: a high school girl with purple hair, gold eyes, blond hair, and blue eyes, a high school girl with black hair, and green eyes, and a middle school girl with pink hair and green eyes, straight hair, gray school uniform blazer, light blue tie, and blue School uniform skirt, black tights
AI's output feels closer to a game expo.
The girls are cute though.