I would like to point out.
I said, 'this is how I draw guides'. they don't essentially follow any measurements, but only what I 'see' and 'find' that works. It doesn't mean that it would work for everyone.
That's the only rule I follow when I draw. I don't follow any number of heads.
I think I'll make some of these xD;
This is how I make guidelines when doing ref sheets.
This one's for a small female turnaround.
there's still the Full Front and the Full back, but I think it's better to show 3/4ths from and back xD;
hope it helps? xD
Male TA1 : [link]