Ethereal mermaid lurking in a shadowy lake, her presence is wet and dense, exuding an aura of mystery and allure. She embodies the siren's call, an unholy figure in an unsettling, eerie tableau. Her intricate scales shimmer with an ominous gleam under the dramatic lighting, her form captured in rich, photorealistic detail. The cinematic atmosphere envelops her in a chilling darkness, an intricately designed vision reminiscent of an unsettling tale of horror, captured in stunning 8k resolution, evoking both fascination and dread.