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A thumbnail sketch is a very small, rough, rapidly produced drawing used to try out ideas during the concept phase of the design process.
A sketch, which serves the purpose of a rough or scratch drawing in order to draw a bigger drawing or art by the artist, is known as a thumbnail sketch.
It is a rough representation of the drawings to be made by the artists in the near future. It is also known as an abbreviated sketch.
Hence, the thumbnail sketch is explained above.
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