Draw a large rectangle for the pool outline
Add a second inner rectangle to show the pool edge
Sketch the water surface inside the pool
Draw a ladder on one side
Add pool tiles or coping around the top edge
Include lane lines if it is a swimming pool
Draw steps or a diving board if desired
Add water ripples and reflections
Outline the pool deck around the outside
Shade the water and surrounding areas
Clean up the sketch and darken the final lines