you do not follow face muscles for face topology
google / face topology / images .ya see they all there topology looks a like

you can watch the 7 lessons
http://cgcookie.com/blender/cgc-courses/learning-mesh-topology-collection/

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primative
cube,sphere,cone,pyramid etc etc.none are perfect topology.
only the torus ,open pipe that I can think of has perfect topology
there no such thing as perfect topology for a character.

a SubD quad mesh vertice should have 4 edges attached to it.
3 or 5 ok ,6 ya pushing it.never 7 or more.

when you model with tri's n ngones and ya SubD once. makes the mesh 100% quads.

Game mesh 100% tri'ed don't really matter.
never counted but I would say 8 give or take a few at the most.

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Artist version of human ratio _did you know superman is 4 feet 8 inches tall ?

Since DAZ Poser & DC,Marvel and just about all Artist follows these Ratios more or less so are all characters.

"HEAD" is 5 eyes wide 7 eyes tall , "BODY" 8 heads tall.

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I'm not sure. Did the greeks start the "HEAD" is 5 eyes wide 7 eyes tall , "BODY" 8 heads tall ?

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance