A majestic great white shark superhero donning elaborate, ornate armor with intricate engravings stands triumphantly in the vibrant cityscape of Atlantis. The city glimmers beneath the ocean, surrounded by swirling fish and bubbles in a background teeming with life. The setting is cast in the warm, golden hues of dawn, imbuing the scene with an ethereal quality. Designed in the lively and dynamic style of anime and manga, the poster showcases vivid and bright colors, with a focus on high detail and clarity. The piece is reminiscent of a cinematic movie poster, creating a sense of epic adventure and excitement, rendered in 8K HD and CMYK for brilliant, crisp visuals. The overall mood is one of joy and triumph, enhanced by dramatic, cinematic lighting that highlights the superhero's heroic stance and the enchanting beauty of this underwater realm.