Not sure what you shot with. But if digital, make sure you set that focus point on the eyes and the re-compose. That first image is slightly out of focus on the eyes.
And like others have said, even a flash light can produce a beautiful catch light in her eyes!
Your composition is spot on.
Would like to see different lighting styles- maybe start using natural light. The fluorescent lighting in the last two makes the image seem flat. Maybe it's just me, but that type of lighting has a "stale" look in a way.
And also good job on that bokeh! :3
-Canon 580 EXII