A negative space drawing is when you color in everything except the background. You outline the drawing but then instead of coloring in the object, you color the outside.
In my cutout I found negative space by looking at the darker spots. In my drawing however I outlined the object then shaded around it.
It helps an artist to see negative space because it makes it clear what they should draw.
Seeing in negative space helps to give an art work a background. It helps make the drawing more 3-D.