2. To make full use of the page, put the vanishing points as far to the left and right as possible. In reality, the vanishing points should be off the edges of your page.
Decide where the corner of the room should go. If you are closer to the wall on your right, place it towards the right of the page. Also decide on a height, making sure to leave room for some of the ceiling and floor to show up in the final drawing. Remember to consider your eye level (horizon line) in relation to both the ceiling and floor.
3. Connect the top and bottom of the corner line to each of the vanishing points. These lines represent where the walls hit the ceiling and floors.
4. All parallel lines converge at the same vanishing point. Check to see where the ceiling and floor lines converge to find the vanishing point for the tops of doors or other parallel objects.
Object of the same size (such as the doors) will appear to become smaller the further away they get.
Draw a circle that reaches from one vanishing point to the other to find the outer edges of your drawing. Anything falling outside of that circle will look distorted.
6. Draw your picture plane within the circle. Notice how the vanishing points are located outside of the final picture plane.
7. Finally, erase the imaginary lines. The final result will be a realistic drawing that gives the illusion of 3d space.