Answer:
Unity is when all the elements in a work look as though they belong together. Pattern is a two-dimensional, decorative visual repetition. It uses the art elements in planned repetitions or random repetitions to enhance surfaces of paintings, drawings or even sculptures.
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Mezzotint’s tone is created using a special tool, like with drypoint. As the tool moves along the metal surface, it roughs the surface and creates different levels of grooves. When ink is applied to the surface, the varying levels of grooves provide the illusion of various tones and half-tones, while still using the same color of ink. This method is one of the best representation of monochromatic art.