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But that's why they're called "presumptions", no more suspect than a hypothesis. You still have the responsibility to verify the accuracy of what they suggest. No one here has come even close to arguing that the presumptions trump what you see.
Be careful, though -- they might! Not everyone is going to "see" things correctly the first time (and some who think they do, don't), and if they need guidance to help self-assess their work, the presumptions are useful. That's all. They're useful. MOST of the time they result in accurate placement of anatomical features. I've benefited too many times from having them in the toolbox to get particular about how I build a picture. They're tools bought and paid for, engraved with the ID of yours truly. I don't lend them out, but I'll tell you where to get your own.
John --
I have that book here in front of me. It's where I first learned of the head-size relative proportions. I don't recall if Hamm or someone else says that the more "typical" human size is 7.5 heads, and that the 8-head measure is actually somewhat idealized. But who cares? (And who wants to figure out where that .5 head goes in the scheme of things?)
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