Who was the 31st president? https://www. you tube. com/watch?v=qaq0nNXy0ak
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Herbert Hoover

Hope this helps!

Before serving as America's 31st President from 1929 to 1933, Herbert Hoover

Explanation:

HE had achieved international success as a mining engineer and worldwide gratitude as “The Great Humanitarian” who fed war-torn Europe during and after World War I.

variety in color and variety in texture

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artists need to create a realistic interpretation so that people in general can relate to the artwork. for a common people, an artist's impression gets increased only if he can create something which would look realistic. an abstract is difficult for a common people to understand whereas if a person can draw a girl with simple pencil sketch and if that looks like a real figure then the latter will be praised more than the former.