Draw a wavy horizontal line near the bottom for the seafloor
Sketch large rock-like coral shapes along the bottom
Add branching coral forms rising upward
Draw rounded coral mounds and fan shapes
Include sea plants and seaweed between the corals
Add small fish swimming around the reef
Draw bubbles and tiny sea details in the water
Add texture lines and dots on the coral surfaces
Vary the sizes and shapes of the reef elements
Outline the drawing with clean, bold lines
Erase extra sketch marks
Color the coral in bright reds, oranges, pinks, and purples
Color the sea plants in greens and yellows
Color the fish in contrasting bright colors
Shade the water in blue tones
Add highlights to make the reef look lively