Well, if I can post a quote from the link you provided: "In reality, most people are about 7 1/2 head lengths, or even 6 1/2 head lengths. But this just doesn't look "right" when drawn on paper. So, it is acceptable (and strongly encouraged) to heighten the figure a bit. 8 head lengths is the recommended standard for figure drawings (or even 8 1/2 heads, if the person is very tall and "heroic")." So, your paraphrasing is "skewed" a bit from the info you posted (unless I missed it or was supposed to delve further into the site you provided). I think a key piece of information is that figures drawn on paper at the correct number of heads just doesn't look right and, therefore, the author recommends using 8 heads instead. BTW, I did a search on that page for "fashion" and didn't get a hit, so not sure where you based your comment, "Eight head lenghts size is for fashion models" from. Again...perhaps I was supposed to scour the whole website.