They will create their landscape in two phases. First they will plan and sketch a landscape to show distance and space. Then they will use colored pencils to create additional depth. The sketches and drawing First they will sketch their composition on scratch paper. Overlapping objects show which is farther.
Objects have less detail as they get farther away.
If your students are younger or more inexperienced, you choose to spend more time on the basic concepts or limit them to the simpler ones. Encourage them to do several quick sketches on scratch paper before starting on their final drawing. You may want to approve a sketch before giving them drawing paper. You may also want them to label the depth concepts on their sketches so you can easily check for understanding. Once they have their drawing paper, remind them how to sketch lightly in case they want to erase.