Because of the title of the photo I wanted to vote for the bra on one, but that isn't the case with your photos. The title doesn't always reflect the first glance, but something more. I voted for the hands up, pushing her hair. The drawer is also open the most and the object inside is almost peaking out, and her legs are placed lady like in front of her. The flash can be distracting but again, I think I want it in the photo.
1. Her hair, great expression, and her pose, minus the angle of her left arm, legs with feet on the on the opened drawer, and the light's reflection in the mirror. The reflection itself is not as problematic in this one as in 2. 2. Her expression, the slight variance of lighting or exposure and composition shift from the other two, the texture/pattern of her lingerie works well with the room, minus the light's reflection, although its exposure affected the rest of the image positively, and slight harshness of the shadow over part of her right eye. 3. The hiding of the light's reflection in the mirror and her pose, minus the position of her right arm and her expression, especially her eyes in this one.
...The difference of including or excluding lingerie not being a factor in the consideration, I would perhaps have to say 2 works best overall to me, with 1 as a very, very close second just from her expression combined with hair action...
I like this, on your next upload, can you give us a link or a tutorial how you were able to set this up? this is fantastic. I picked the one that is most popular, where the light is hidden by her head and her legs, feet and in a more natural pose.
Number 3 is best. First obvious observation is the flash reflection in the mirror works as a backlight to highlight the model's hair and she becomes the focal point. In the other two the flash reflections in the mirror become the very distracting focal points - as you are well aware, good tester though.
I really do love the posing of the second one, but her expression is too vacant. She's too much like a deer in headlights. In the third one, I love the halo created behind her head from the light in the mirror behind her head, and her expression...those two combined would be perfect. But as far as overall aesthetic, I have to go with the first one.
I love the pose in Number 1. but find the reflection of the flash in the mirror a little distracting.. the eye seems to be drawn to it as soon as you view the photo.. (as others have already mentioned !)
I like the first choice most (actually 35%) because of the motion. Its not important that she's naked, but there is a good eye contact. She sits more tightly what gives the shape of her hips a better accent than in the other one. (Because of this i like the dressed one more instead of the current place one...)
It looks like the light setup is the same for all three but I like the pose where she is in black. Mainly because of her legs, it helps carry the curves in her posture all the way down the photo. In the other two, her leg positions feel too abrupt and sharp.