Top quality, highly detailed, 8K wallpaper, monochrome tone banner design, grey, black, white, dark red, schoolgirl and laser gun, one girl, red eyes, laser gun, school uniform, future city, Shiro Masamune style, Big O, flat decal, watercolor style. Concept art, colorful, --style expressive --ar 16:9 --niji 5 --s 400