This video reviews the important parts of an artwork that students should generally include for it to be considered complete. Including Foreground, Middleground, Background, and overlap help develop the sense of depth in a work of art. CORRECTION: in Hokusai's "Great Wave" image, the background is Mount Fuji, not a wave.
One of the coolest things about Star Wars is the huge widescreen combat, especially in the original trilogy. The battles of Yavin and Hoth are mentioned in the same breath as Helms Deep and Wolf 359, when people talk about huge epic struggles.