Before you attempt the next exercise… research the basics of linear perspective.
Linear perspective helps attain the illusion of a three-dimensional image on a two-dimensional surface.
Parallel lines appear to meet together in the distance at a vanishing point, this point may or may not be within the actual image but should the lines be extended they should meet at this point.
Perspective when recreated on a two-dimensional surface gives the illusion that objects close to the viewer are larger than those further away .
Objects that are pointing directly at the viewer are foreshortened to give this impression ie a finger-pointing straight forwards appears shorter than if pointing left or right.
To assist in creating linear perspective it is helpful to establish a horizon line or eye level. Lines below the eye level with angle up towards it and lines above will angle down towards it – this is the vanishing point on the horizon or eye level.
Most commonly used are one, two and three-point perspective. This relates to the number of vanishing points in the image.
One point – a simple or single view disappearing off into the distance eg road or railway track.
Two point – for two receding views, eg corner walls equals two vanishing points
Three point – views from above or below, where there are three vanishing points, those as in two point and those receding upwards or down.
There is also zero point perspective where no parallel lines exist and therefore no vanishing point. This is where scale comes into play as in the third point above. Aerial perspective also assists by less contrast in colour and tone to depict distance.