One might ask: "Why should I study about it? I paint what I see!"
First of all, painting is 90 % drawing.
Second of all, most painters paint what they "think" they see and not what the actually see.
Last of all, sometimes you need to paint a posthumous portrait, and in that case, the model cannot sit for you, so you have to use these rules to make a better job. Sometimes the lighting in a photograph is horrible, but you liked the pose, so, you can change the values, lighting, etc, if you master perspective.
Hope it helps.
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