masterpiece, best quality, solo, 1girl, aged up, happy, medium breasts, you_watanabe, watanabe_you, short hair, brown hair, swept bangs, blue eyes, elegant marine-themed idol gown, deep sea-blue and white gradient dress, sheer sleeves, pearl hair accessory, ocean-floor fantasy stage with coral and glowing fish, gentle smile, soft lighting, graceful and enchanting vibe
