A simple yet cute watercolor painting of a little prince is on a sunny beach, building a massive sandcastle with the help of cheerful sea creatures like crabs and octopuses. The prince, dressed in a simple outfit: white t-shirt and light-blue shorts, is focused and smiling as the castle takes shape. The background features a calm sea and a vibrant sunset with hues of pastel colors: orange, pink, and purple. The scene is lively and filled with the playful energy of the creatures, with the style inspired by golden age Disney, featuring expressive characters, rich colors, and a sense of magic. The image should evoke creativity and the joy of building something grand from simple beginnings.: cartoon children's book illustration, in style of Mary Blair, hand-drawn details, soft edges, and subtle gradients --ar 2:3