Describe some differences between a sketch and a completed work based on a sketch. conclude with your assessment of the process of preliminary drawings as an essential or nonessential part of the process of completing a work

The sketch is where the artist will determine the principal aspects of his/her final painting. So, there he/she will create poses, determine the point of view, the positions of the characters in the canvas. In a sketch the artist doesn't worry about the backgrounds of the scene or the complex aspects of the final composition. Instead, he/she will study how to compose the scene. Because of that, the sketch is rough, with edit marks, there's no care with the aesthetics, is just a preliminary step for the final composition. It's important because is where the artist will trace the painting and the way how the audience should look at it.

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