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Photorealistic 3D render of a mermaid inside a gigantic ornate clock. The interior is a submerged, water-filled chamber with warm brass gears, riveted panels, and a glass dome overhead. The mermaid sits on a colossal bronze gear, her emerald-green hair flowing and her tail shimmering with iridescent aqua and teal scales. Gentle currents swirl around her; bubbles rise and subtle caustics play across her wet skin and the metallic surfaces. Light filters through the clock’s glass dial, casting gold-tinted highlights and elongated shadows. The clock face features Roman numerals and a frozen pendulum in the background; intricate filigree and engravings adorn the walls. Use cinematic lighting, shallow depth of field, and micro-detail on textures: wet skin, translucent fins, gleaming brass, and weathered copper. Camera angle slightly below eye level, focusing on the mermaid with the giant clock looming around her. Color palette: deep blues and aquamarines contrasted with warm brass and gold; mood: mysterious, magical, serene.