Draw a horizontal line for the horizon
Sketch the ocean surface with gentle waves
Add larger wave shapes in the foreground
Draw smaller ripples farther away
Shade the water with light and dark blue tones
Add white highlights on wave crests
Draw reflections of the sky on the water
Include a sun or moon reflection if desired
Add foam near the shore or wave tops
Draw a beach, rocks, or distant land if desired
Add sea life like fish, dolphins, or boats if desired
Blend colors smoothly for a natural look