What is the difference between anecdotal and factual evidence?

Factual Evidence is evidence that can be proven to be true, Anecdotal Evidence is evidence that is collected from someone’s anecdote and can’t be proven.

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.