The three aliens in this coloring page have bright green skin and are wearing uniforms resembling those from the planet Cossack. They have helmets on, and each of them is armed with what look like guns. They are standing in a spaceship with a metal exterior, and the details of the interior remain to be seen. To bring this image to life, you could start by coloring the aliens' skin and clothing a deep emerald green. Highlight different parts of their outfits with subtle hints of lighter and darker greens. For the ship, use different shades of silver, along with hints of yellow and red to give the design some depth. If you're feeling creative, you could fill the ship's interior with your own imagined designs and structure.