Minimalist children's book cover illustration featuring a small boy standing at the center, looking up with wide eyes. He is surrounded by tall, towering walls on either side, creating an intense perspective from the top to the bottom, with the vanishing point converging at the center where the boy stands. The overall composition is simple yet powerful, emphasizing the boy's sense of scale and the vastness of the space around him --cref <https://s.mj.run/4KLObHzZB3U> --cw 10 --niji 6