How can i use shapes to create realistic drawings?

Shapes to create realistic drawings:

By drawing the shapes and then defining the form you want the shape to take and clean up the drawing gives a realistic effect.

Shapes can be used to create realistic drawing by simplifying the shape the drawing takes and then defining the drawing by smudging the edges and cleaning up the drawing gives a realistic effect to the drawing.

This is how an Artist can use the simple shapes to create realistic drawings.