Harley Quinn, mermaid, underwater, shiny tail, pink and blue scales, curly red hair, clown makeup, white and black eye shadow, bright red lipstick, playful expression, sitting on a rock, seaweed wrapped around waist, ocean creatures surrounding, colorful coral reefs, schools of fish swimming by, sunken treasure chest in background, warm sunlight filtering through water, soft focus, cinematic composition, vibrant colors.