I would absolutely not use any lens shorter than a 50mm for most reference photography. If you are shooting from a distance and including the entire body you can get away with a more wide ange lens. But generally you are safer to stay at least 40 mm and longer to avoid distortions. For instance, using a wider angle lens, a hand will look too large if it is much closer to the lens than the face.
By short lenses I mean small mm numbers, and longer lenses refer to larger mm numbers.
Also remember that the farther you are from the subject the less distortion you will get.
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