Create an awe-inspiring, photorealistic image of a fire warrior with striking updo white hair and captivating eyes, set in the vivid and colorful cinematic lighting of an alien landscape inspired by Warhammer 40k. This scene, designed with RTX and Unreal Engine technology, should feature a Shas Warrior in a dynamic pose, exuding an aggressive, determined expression. The warrior is rendered with hyper-realistic textures and vivid details, capturing vibrant colors that highlight the complexities of their armor. Utilize a 50mm prime lens with an F/2.8 aperture to achieve sharp focus and lifelike clarity, delivering an 8k resolution masterpiece worthy of a detailed fanart presentation. The picturesque background should portray an alien planet with intricate details that complement the warrior's stance, all while maintaining an engaging sci-fi aesthetic.