Hi Jim;
I've mentioned Andrew Loomis before as have others on this site, he produced a number of books on how to draw, much of which can be used by woodcarvers when carving the human face.
Here's a web site I've posted before...again as others have, that his complete book on drawing the head and hands is available, all your questions about head width, profile etc can be answered by downloading all the book or just pages that you find interesting.
http://d538518.u320.bigcrawler.com/h.../headhands.htm
There are numerous other books out there on drawing the human figure, all will provide info on human proportions that can be used by woodcarvers, just remember everyone does not match up to these exact proportions , they are only a guideline.

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OG