Step #1
Begin with a 3-D Rectangular figure for the base of the body,
Step #2
Draw the hands and legs of the bench as shown and enhance them.
Step #3
Draw the seating as shown and enhance it.
Step #4
Draw the backrest as shown and enhance it.
Step #5
Draw the other necessary little elements that enhance the presence of it.
Step #6
Complete the drawing and add the necessary finishing touch.