The large tank is the star of this scene, and it's the brightest color in the page. Start by coloring the tank in a metallic green to give it a realistic feel. The turret should be an even darker shade of green, like olive, while the barrel should be painted a pale silver. Moving on to the wheels and tread, shade them in a deep off-black to match the overall military theme. The soldiers should be dressed in a dark, forest green to help them stand out against the tank. Add small details like insignia, helmets, and other equipment with shades of gray, brown and khaki to help bring the painting together.