In the brilliant future, human wars will be fought by formidable machines with powerful guns. The warriors will be clad in tough metal armor with flat, slatable helmets topped with dark visors to guard their eyes. Their guns will launch heavy bullets at lightning speeds, giving these soldiers formidable power. When it comes to coloring this scene, I suggest using a grayscale palette to emphasize the metallic armor and visors. Deep shades of grey for the armor and lighter shades for weapons will make the contrast of their sophisticated machines even more impressive. Whatever else you decide to add, don't forget to use shades of white for light reflections on the surface of the metal and black for those mysterious visors. Your warrior's armor and weapons will look weapon-ready and futuristic!