Your drawing should exhibit a dynamic composition of large and small silhouettes and isolated negative areas.
Fill the silhouettes and shapes with patterns and textures. Keep in mind that there are three categories of textures: real, simulated and invented. Therefore, not all of your textures need be from life some may be made from your imagination. The textures may logically fit with the silhouettes or not. In other words, an orange could have the texture of bricks, wood, etc.
You may also fill the silhouettes with other spaces as in the work of Magritte. Remember, the silhouette of the man in the bowler hat was filled with a beach scene.
Pay attention to your compositional balance and the principles of design.