As you look at the page, your eyes might first land on the detailed submarine equipped with mechanical robotic arms for scientific discovery. Floating nearby is a large sea turtle and a wide manta ray that seems to be flying through the water. Tucked among the intricate coral reefs, you can spot a shy octopus and pairs of tiny seahorses clinging to the plants.

Look closely to find clownfish darting in and out of wavy sea anemones. The entire background is filled with various other fish and dense patterns of sponges and reef structures. Every corner of the image is packed with life, providing plenty of small details to color from the bubbles rising to the surface to the textures on the ocean floor.

Because this is a dense scene, you might want to start with the larger subjects like the submarine and the sea turtle. Using bright yellows or oranges for the sub can make it pop against the blue water. For the coral reefs, feel free to use every color in your box, such as neon pinks, deep purples, and lime greens to show how diverse the ocean is.

Since the lines are quite close together, colored pencils or fine-tip markers are excellent choices for reaching the tiny seahorses and the patterns on the manta ray. You can create a sense of depth by coloring the water darker at the bottom and lighter toward the top of the page. Layering different shades of blue and teal will give the water a more realistic, shimmering effect.