Draw a long curved line for the bottom of the boat
Add two slanted lines upward from each end
Connect the top ends with a straight or slightly curved line
Draw the boat’s hull shape by closing the sides
Add a small vertical line for the mast if desired
Draw a triangle or rectangle for the sail
Add a second sail if wanted
Draw a small cabin or deck shape on top
Add a window or door on the cabin
Draw a line inside the boat for the waterline
Add small waves around the boat
Outline the final shape with darker lines
Erase extra sketch lines
Color the boat as desired