This coloring page offers a unique scene: a group of marines dressed in combat uniforms, each armed with a gun, in a desert landscape with mountains in the far distance. To create a sense of foreboding in the image, I would opt to color the marines' uniforms in shades of dark green, while using lighter hues of blue and yellow for the sky and sand respectively. The detail of the mountain range could be enhanced by applying a range of browns and greys for the rocky terrain. Adding a few splashes of white for the clouds in the sky can help bring out the shapes of the landscape. Overall, this coloring page is a great opportunity to create a fascinating scene filled with tension and adventure.