Quote:
Originally Posted by blackmonsters
I see an artist portrait in paint and it's like the person is going to jump out of the painting and
start talking; but computer drawn faces look like I need shovel to did grave.

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https://en.wikipedia.org/wiki/Uncanny_valley
In a nutshell, the painter's looks not real enough and just looks good, and the computer one looks very real, but it causes you to feel that "something is wrong".