Epic cinematic 8k wallpaper of Ellen Ripley from the Alien movie, with a resolute yet fearful expression, wearing a white tank top. She's in a dynamic, half-body action pose, wide-angle shot, cheeks and forehead glistening with sweat. Her back is pressed firmly against a metal wall in the dimly lit corridors of the Nostromo space shuttle. The scene is set within a dark, sci-fi environment, featuring ultra-detailed visuals with rim lighting highlighting her determination. The composition is centered, capturing a stoic cinematic feel with dark, moody ambient lighting, enhanced by high contrast and shallow depth of field. The lighting relies on advanced techniques, including RTX ray tracing and Rembrandt-style illumination, creating ultra-realistic reflections and shadows. The rendering is optimized for 8k quality, showcasing an epic and immersive visual experience, akin to a sleek, cinematic movie still.