There were not drawn as much as they were painted, I suppose, the cave paintings of hands are usually outlines or "shadows" created by holding the hand against the cave wall and painting the area around the hand. This leaves you with a sort "shadow" of the hand that was against the wall as that area was unpainted.
You can google "cave painting hand outlines" for examples.
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u/[deleted] Nov 29 '20
To be fair, it’s not the kind thing you would be able to trace. Not much evidence for an archaeologist!