Definition of "Thumbnail Sketch" by Graphic Design Newcastle:
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A thumbnail sketch is a small, quick, and simple drawing used by designers and artists to explore and visualize ideas during the early stages of the creative process. Typically rough and not highly detailed, thumbnail sketches help in planning composition, layout, and overall design concepts before committing to a more refined version. They are often used in graphic design, illustration, animation, and other visual arts to brainstorm multiple concepts efficiently.