INFO:
Before you make a diorama, sketch out your concept and gather all of the materials you’ll need. Select a box or a frame that is several inches deep, like a shoe box turned on its side. Start by creating your background on the back and sides of the box, then decorate the bottom of the box to create your ground or floor. Working from the back of the box to the front, add in details to make your scene seem more realistic. For example, if you’re making a nature diorama, you could add in trees, rocks, bushes, and even animals.
Video: How to Make a Diorama - wikiHow