Straight shot like this works when there is a separation from your subject and your background. In this case it doesn't work very well because you subject is too close to the wall and the lighting is flat so nothing is adding dimension to your shot. I am pretty sure that if you would have shot this from an angle, with your subject turned a little bit on the side, you could have got a little rim light and some dimension
a little bit like this.
I always like to shoot some straight shot like this during my shoots. I am not saying this shot is perfect but overall I liked it enough to give it to the client.
You see how i created dimension to the photo by having her a few feet from the wall and have her stand at an angle with the wall. This was shot with a 70-200, at 100mm at F3.5 (to decrease the dof a bit more so it add a bit more dimention!)
By putting one of her side to a darker place (wall blocking light, and exposing for he face, you get a bit of rim light on her right side (pointed towards light) and just a bit of shadows.