One-point perspective is a simple form of linear perspective with only one vanishing point. Remember to always draw the horizon line first, then determine the placement of the vanishing point on the horizon, which should not be far from the center of the scene. First draw the horizon line, then determine the placement of your two vanishing points on either side of the paper on the horizon line. As you work out the perspective of the elements in the scene, extend the parallel lines either up or down toward the vanishing point, depending on the vantange point you want to create for the viewer.
Dog’s Eye Level, One-Point Perspective
Here the horizon line and vanishing point are both at the dog’s eye level. Notice that all parallel lines below the dog’s eye level angle up toward the vanishing point and all lines above the dog’s eye level angle down.
Man’s Eye Level, One-Point Perspective
Here the horizon line is at the man’s eye level, so this view shows a vantage point at the same height as his eye level. All parallel lines below the man’s eye level angle up toward the vanishing point and those above it angle down.
Overhead View, One-Point Perspective
In this view, the horizon is above both the man and the dog. The vantage point is somewhere above the man and the dog creating the feeling that the viewer is looking down on the scene. All parallel lines angle up to converge at the vanishing point.