Design a book cover with a minimalistic approach featuring a young boy, around 8 years old, standing on a small stage against a plain white background. The boy has blushing cheeks, looking shy yet determined. His shadow on the white wall behind him transforms into a large, confident superhero with a cape, symbolizing his inner strength. The title 'Luka, the Shy Superhero' is displayed at the top in bold, playful letters. The overall design is clean and simple, with a focus on the boy and his shadow --cref <https://s.mj.run/4KLObHzZB3U> --cw 70 --niji 6