At the center of the image, the large plesiosaur stretches its long neck across the page. Surrounding it are several small fish darting through the water and a detailed ammonite shell resting near the bottom. The seafloor is decorated with wavy seaweed, textured coral, and smooth rocks.

In the distance, two volcanoes sit on the ocean floor, sending up plumes of activity. Small bubbles float toward the waves at the surface, creating a sense of movement throughout the entire underwater environment. Every corner of this scene is filled with different shapes and textures, from the smooth skin of the reptile to the bumpy surface of the coral.

You might choose a soft teal or a deep forest green for the plesiosaur to help it stand out against the blue water. The coral and fish are great opportunities to use bright pinks, yellows, and purples to make the reef look lively. For the volcanoes, consider using a glowing orange or red to show the heat coming from the vents.

If you want to create a sense of depth, try using lighter blues for the water at the top near the waves and darker shades of blue or indigo as you reach the rocky bottom. Using different pressures with your crayons or pencils can help make the bubbles look transparent and light compared to the heavy rocks.