10-second hand-drawn 2D watercolor storybook animation, like a gentle children's

10-second hand-drawn 2D watercolor storybook animation, like a gentle children's picture book come to life: visible paper texture, soft watercolor washes, delicate ink outlines, pastel turquoise and coral palette, slightly wobbly hand-drawn line boil. No text, no captions. Music: soft music-box melody with bubbles, no voices. A calm underwater garden of swaying seagrass and coral, light ripples...