Draw the horizon line
Sketch the ocean surface
Add gentle wave curves
Vary the wave sizes
Draw larger waves in the foreground
Add smaller ripples in the distance
Create foam on wave crests
Shade the water with darker tones below
Leave lighter areas for reflections
Add depth with layered wave lines
Draw a shoreline if desired
Include rocks, sand, or a boat if desired
Refine the wave shapes
Add final details and highlights