Portrait of an 8k ultra-realistic samurai warrior brandishing a yellow war flag banner, displaying a full body view in exquisite yellow and black armor. The scene is set with intricate, cinematic lighting that highlights high-definition, vibrant illumination. The setting is hyperrealistic with extreme attention to high details, incorporating a sharp focus as if rendered in Unreal Engine 5. The atmosphere is dark, accentuated with lumen reflections and a captivating depth of field, resembling fine photography. The samurai stands in a reddish, war-torn environment filled with swirling smoke and glowing embers, offering a striking cinematic effect. The moment is caught in an action-packed 9:16 aspect ratio.