Define linear perspective, horizon line, vanishing point, orthogonal.

Linear perspective comes into play when orthogonal (parallel) lines that recede into the distance appear to get closer together as they converge at a vanishing point on the composition's horizon line.  The line at the top of mountains or buildings is not the horizon line; these objects “rest” on the horizon line.

Explanation:

Linear perspective: a type of perspective used by artists in which the relative size, shape, and position of objects are determined by drawn or imagined lines converging at a point on the horizon.

Horizon line: Horizon line/eye level refer to a physical/visual boundary where sky separates from land or water. It is the actual height of the viewer's eyes when looking at an object, interior scene, or an exterior scene.

Vanishing point: the point at which something that has been growing smaller or increasingly faint disappears altogether.

Orthogonal: of or involving right angles; at right angles

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explanation:

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.