[jford]

You're lucky to have such a lovely subject to practice with.
Frankly, the first two images seem a bit soft - lacking in sharpness - to me. I note that the histogram of the image shows nothing in the true black region, and a similar lack of true white. Kinda suggests that your exposure is off a bit, I think. I think you needed to bounce a bit more light onto her face. The third image seems sharpest, and the histogram is somewhat better - more spread out between white and black. The angle isn't too flattering, but the color looks pretty good.
OTOH, I'm by no means a great shooter, so keep in mind that these comments are worth less than you paid for 'em.
Keep shooting, and thanks for sharing.

[boydapa3]

Thanks Jford for very technical comment. I need those kind of comment since I'm just started in shooting photos. That's my very first photoshoot and hven't read any technical stuffs.