Otome game CG illustration, exquisitely aesthetic, inside a ...

Otome game CG illustration, exquisitely aesthetic, inside a massive underwater glass tunnel. Sunlight filtering through the seawater casts dynamic caustics. A couple; the male lead, wearing an elegant deep-sea blue formal suit, is presenting a glowing pearl necklace from a seashell box to the female lead. The female lead wears a water-blue gradient tulle dress, her expression filled with joy and emotion. Outside the glass are vibrant coral reefs, schools of fish, and a giant manta ray. Dreamy atmosphere, transparency, high detail, intricate clothing details, character close-up, facial expression close-up. 8k resolution. Subtle hints of green and brown in the palette.