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palm of your hand against your chin and spread your fingers upward.
A nose is the same length as a thumb. The ear the same length as a nose.
And, having gleaned these few ordinarily accepted rules, you will probably find your next model will have arms too long, legs too short, and a nose disagreeing most profoundly with the length of the thumb. Nature is a law unto itself, and I bring these few suggestions to you with some misgivings.
If your eye insists that your model measures but five heads high, accept that as a fact. Very few human beings are correctly proportioned.