3. Draw the Cabins
Form the guard rails on the front of the decks with two intersecting curved lines. Draw the vertical rail supports with a series of angled straight lines that are parallel to one another and evenly spaced. Add details to the cabins with straight and slightly curved lines. Place a boxlike shape above the cabin of the boat in the center. Use a wide, upside down, U-shaped line for the upper part of the boat on the left.