Utilize the rule that light advances and darkness recedes in graphic designs. Color an object with light colors, like white, or bright colors like red, orange and yellow to make the object appear closer. Color an object with a dark color, such as black or cool colors like dark blue or dark green to make it appear further in the background.
Make one object appear closer to the viewer than another object by drawing it bigger than the other object. Draw the smaller object at a position higher up on the page, using perspective drawing and to the left of the larger object to enhance the illusion that the smaller object is actually farther away.
Shade an object with high contrast to make it appear closer and shade an object with low contrast to make it appear farther away. Draw an oval with one side shaded with a dark black and the other side white to make it appear closer. Draw another oval the same size with low-contrast shading. Shade this oval entirely in a mid-range gray. Now shade the left side of this oval a slightly darker shade of gray than the right side. Lightly remove the gray shading in just a few areas to give this distant oval added depth.
Draw objects that you want to appear farther away with thinner lines than objects you want to appear closer. If one object is drawn twice as large as another similar object, draw the lines of the smaller object such that they are one-half the width of the lines on the larger object.
Remember that it is difficult to distinguish details in objects farther in the distance. This is because the farther away the object is, the more difficult it is to distinguish the dark and light areas of the object. This is related to the fact that light tends to disperse as it travels farther away from its originating source -- the object itself.