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 upper edge or deck line inside the shape
Add a small cabin or cabin outline on top if desired
Draw a mast or pole if making a sailboat
Add sails as triangles attached to the mast
Draw windows, a door, or other small details
Add a flag on top if desired
Draw water lines around the boat
Outline the drawing with a darker pen or pencil
Erase extra sketch lines
Color the boat and water