The way you ask questions and for help makes me think you’re kind of a jerk, but you do ask good questions, which helps.
Triangles are bad for subsurf and animation because they don’t deform well. In modelling, tris are ok, but often unnecessary, and they don’t subsurf well. The same problem occurs with quads that meet in points with 5 or more edges(poles), they screw up the subsurf and you get points sticking out.
Torq’s face tutorial and edgeloops give you a more natural looking face because the loops follow the natural geometry of the underlying muscles of the face, resulting in a face that looks pleasing to the eye, deforms well under subsurf, and is easily animateable. Topology as discussed here is in the underlying structure of faces, etc. to follow the loops and path of the face to appear more natural, not necessarily the face, but all body parts actually, it is a basic part of organic modelling, to make things flow and “feel” more organic and natural.
In addition to Torq’s face tutorial, which is very admired, and very good, take a look at Calvin’s simple page and some of the very low poly stuff he has done to get a feel for animation and using simple loops that you can then expand upon. Also you should downloadLen’s head for some great examples of topology, and spiral loops coming together for excellent results.
For more information on poles, etc, which include loops and how to create and manipulate them to your own end, check out this post on subdivision modelling
Also, do a search for realistic head modelling, and don’t be afraid to use other software’s tutorials, a plane is a plane, no matter the program, you can create the poly cage for anything, that’s why there are so many formats for plain old objects, including obj which seems universal.
The head has promise, but without reference photos, or textures it doesn’t look very realistic, but it is appealling. I like it.
Also there is a tutorial on Adrianna’s headfrom Mr. Bomb that is quite good. I think len’s head for broken dreams is amazing though, the spiral loops around the eyes are really a great reference to emulate.
EDIT Oh, and the lower lip and chin could stand to be defined a little more, and if you look at your own face in the mirror, I hope your eyelids and top of your head don’t look like that, but if they do, I feel for ya. Generally your brows and cheek will be vertical from each other in profile.