"Create a book cover for a short comedy story called 'The Substitute Teacher Who Knows Nothing'. Show a realistic classroom scene with a substitute teacher looking visibly confused in front of a blackboard, holding a textbook upside down. The students are subtly reacting—some whispering, some smirking, some raising eyebrows. Use realistic proportions and lighting, but keep the tone humorous. Include space at the top for the title in clear, bold letters. The overall style should be realistic but slightly exaggerated for comedic effect, not cartoony." Voir plus