You could add tongue tension, lifting head when singing higher notes, posture, jaw tension.
Also, I can't remember now but I think it may have been Miller who said that Vibrato was a good indicator of how healthy a voice was so that may be worth investigating from a technique point of view.
I'll tell you what you might find very useful, at least I did, was the papers on technique by Gilles Denizot which you can find at http://gillesdenizot.com
There are also quite a few articles in English on the Atelier du Chant which deal with technique issues such as various tensions and breathing.
I'm hoping that someone out there will write you a long spiel on breathing because I wouldn't know where to start with that.
If you're thinking of going into teaching then I think you should definitely sit down and read Richard Miller "Training Soprano Voices". I have been reading it recently and it is a mindblowingly BRILLIANT book for technique and training. In fact, for the time being I consider it as my singing bible!
I hope some of this is helpful. I can't be as technical as other people out there because I don't teach and still have a long way to go with building up my own vocal technique!!
Kirsty
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