Photorealistic portrait of an ethereally seductive young woman 21 years old as a Yawkyawk, Aboriginal Australian water spirit, long flowing wet dark hair with water lilies, reeds and sacred markings, hypnotic deep brown eyes with ancient glow, flawless dark bronze skin with subtle scale and wave patterns, wearing an extremely revealing sheer minimal outfit made of thin water reeds, shells and translucent fabric with extremely deep plunging neckline almost to navel, open sides fully exposing body, bare hips and legs, alluring mermaid-like pose emerging from a sacred billabong at twilight, mystical cinematic lighting with water reflections, ultra realistic, 8k, photorealism