I tend to agree with kusama10k in that while the photos are generally well taken, they actually are very boring.
You had asked for comments on your technique, not the model. A portrait is the result of interaction between model/sitter and photographer. These kind of "portraits" are not meant to be "deep" and "profound". Even so there is much that can be done. As a photographer, you are to be the director (with exceptions of huge productions where there might be a artistic director and the photographer press the shutter!). So you direct the pose, the positioning of the model, the play of light on the model, the expression, the "tension", etc.
Your photographs (with exception of #3 ) are boring because there is a lack of tension/movement. #3 is interesting because there is a sense of motion which is lacking in all the others. The rest are "static". "static" does not mean lack of tension. Tension can be created even in the face.
Look at the model's expression. Think Fann Wong. There is only one expression. Boring+++++ Stop. Get her to close her eyes to feel the breeze, lift her chin up and get her to smell the air, fold her arms to enjoy the embrace of the flora, etc. Lower her head and stare up towards you as if to devour you etc. Introduce "tension/motion".
Play with the light. You may not even need strobes and reflectors (especially if you are doing it all alone). In #3, you had (accidentaly or intentionally?) put her face into "broad" lighting, making her face broader when in fact her face is quite slim. Turn her face round to the right (in this picture) and you have a "short" lighting which will create quite a different effect. Definitely "darker" and perhaps more mysterious.
So "techniques" are not just what cameras you use. In fact, digipat2003 had asked what is arguably the most unimportant question, viz, "Which camera?". Such pictures can be taken with any modern point and shoot with an aperture priority mode. "Techniques" involve studying your model and light, and the intrepretative play of these between model and photographer.
Oh, one other thing. Get a light meter. "agak agak" is totally unacceptable unless you are Cartier-Bresson or Weston. I understand some matrix metering can be quite good, but in back lighted situations, the computer can be fooled. Use a lightmeter. Next to the camera, the most useful accessories are tripods and lightmeters. I never shoot without taking a reading with my meter.
