<u><em>Answer:</em></u>
<u><em>Thumbnail sketches are:</em></u>
<u><em>Art directors, storyboard artists and graphic designers, as well as other kinds of visual artists, use the term "thumbnail sketch" to describe a small drawing on paper (usually part of a group) used to explore multiple ideas quickly.</em></u>
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<em>Hope this helps:3</em>
Sculpture that represents Renaissance's rebirth of Greek concepts and stylistic elements is David by Michelangelo. Stylistic elements that represent Classical influence are 1) theme of naked male hero and 2) contraposto pose (figure's hips and shoulders to rest at opposing angles and head is turned of to the left). The scultpure is also very detailed (including visible blood vessels). Focusing on men's naked body is a proof of Renaissance's interests in Classical philosophies and cultural heritage.