The model looks uncomfortable and like she has nothing to do but pose in all the photos. I think giving her something natural and comfortable to do could create a good deal of improvement. In #2, the position is kind of striking until I look more at in and see that she is not actually doing anything, and looks uncomfortable in the pose.
Facial expression is really disinterested--you need to engage the model somehow.
The color scheme of the photo could use some work, either to introduce complement or contrast or to pull together the disparate elements--I really don't see the red pillow, blue/white pillow, black dress, and brown pillows as really bespeaking a lot of thought about the color nature of the photos (if it weren't so obviously posed, this would be less of an issue). The red chair totally steals the show in the second photo, to me.
I think you could really stand to use light intensity or color to separate the model from the background better, and also make more subtle tonal changes from shadow to highlight on the model. Catch-lights likely wouldn't hurt, either.
Just a few thoughts.
