Photorealistic concept art of Poseidon, god of the sea, standing in a commanding pose on a stormy shoreline or rising from the ocean waves. He appears as a powerful, mature man with a muscular, divine physique, long flowing seaweed-like dark hair, and a majestic beard streaked with silver. His eyes glow faintly blue, reflecting the depths of the ocean. He wears ornate armor pieces made of coral, gold, and ancient bronze, partially covered by a flowing sea-blue cloak or royal tunic that whips in the wind. In his right hand, he holds a massive trident forged from celestial metal, crackling with aquatic energy and encrusted with glowing blue runes. Around him, the sea roars—water spirals around his feet, and lightning arcs across a stormy sky.