As a teacher and as a singer, I try to keep things as practical as possible.
I believe that the voice can be trained to respond with the most ease and efficiency by fairly simple means, but those simple principles require some years of study and practice. The training of the singer has much in common with the training of the athlete in terms of time and comprehensiveness of approach.
I use imagery sparingly in teaching concepts.
I like to train singing with singing, not with props and non-vocal exercises.
The “sound” we make as our voice gains in ease and power is the voice we learn to love.
I don’t teach to a market; I let each singer’s voice and soul lead them to appropriate outlets. Singers will end up doing what they: a) want and b) do well. Helping them with those two things is my job. Convincing them to like something is not.