How do art museums actually get the pieces of art/exhibition

Curators start doing research to find what artists and objects fit into that theme. They pick key pieces that are necessary for the exhibit and then write loan requests for each museum and to collectors. Private collectors are sometimes reluctant to loan pieces.

Explanation:

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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.