Because people have preconceived ideas of what a face looks like. If I want to paint a realistic face, if I’m trying to do so, I may not have the skills needed to decipher from how my brain believes an eye or a nose looks, and what is really looks like. If I paint upside down, then I just focus on where a shade is darker and what color is where, instead of focusing on the actual subject that I’m trying to paint.
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