The three tanks on the coloring page are a vivid range of colors. The green tank is the smallest, the blue tank is the largest, and the orange tank is in the middle. The tanks are all sitting on the ground in different positions. I would take advantage of these various sizes and colors to really highlight the different tanks. For the green tank, I would use lighter shades of green for its body and darker greens for its tracks and details. For the blue tank, I would use lighter shades of blue for its body and a darker blue for its tracks and details. For the orange tank, I would use lighter shades of orange for its body and darker oranges for its tracks and details. All in all, this could be a vibrant and dynamic coloring page if the right colors are used.