Well not to bag on your girl but there are a few things wrong with the pose. First the way she has her head and eyes turned away from the camera gives the pose a tense and defensive posture. If she was going for that aloof, detached I am a cloths hanger couture fashion look then unfortunately she missed, mostly because of the way she has pulled her eyes all the way around. The result is that the camera only sees the whites of the eyes which gives a subconscious danger signal.
The placement of her feet are back wards. With the inside foot toed into the wall and the outside footed toed to the camera the inside foot is holding her off the wall making it it difficult for her to relax into it. This results in her shoulders being leveled and giving the further impression of tension in the image.
The tense theme continues with the right arm and the stiff just barely hanging on by the tip pinky which tenses the forearm and the wrist.
The straight to the side placement of the left arm closes in the body and only serves to add bulk to her by making her appear to be wider then she actually is. She obviously has some nice curve to her body but that arm dead at the side blocks it off.
As photographers working with models it is inherently our job to direct the model into a pose that flatters her figure and form, contributes to the composition of the images and produces angles and curves that will help guide the viewers eye through the image in a pleasant way.
I think had you directed her to reverse her feet, turn her right hip all the way into the wall raise the right arm up and over her head while rotating to her left at the waist, roll the left shoulder up and forward so she could lower her chin into the side of it as she turned her head to the left her eyes would have still been turned off the central access of the lens but the lens would have still captured the iris of the eye rather then just whites. Last but not least have her bend the elbow of her left arm bringing the hand softly up the hip and create some space and angle between the body and the arm.
Now you have a very feminine pose with a hint of sexy and a hint of aloofness and disinterest on the models part where she conveys the fashion look I believe she was aiming for.
In the end slowing down and directing the pose will benefit both model and photographer. You will be come more comfortable in directing and composing and and will find yourself taking control of the creation of your own images rather then simply taking pictures. This will allow your images to consistently rise to a new level of technical and artistic quality.
Your models will also benefit by becoming more aware of how their body moves, what angles are flattering to her and which ones are not. She will also learn the importance of working with her photographers to achieve images that fit the needs of photographer, model, client and end user.
All of us models and photographers alike want to create the best images we can and it all starts with the fundamentals of posing which in reality are the fundamentals of geometry. Give the eye something to follow and keep it in the image as long as possible and you keep the viewer inside your image longer. The longer the viewer stays inside an image the more likely they are to make an emotional connection with it. If they connect emotionally then they are more likely to buy the image or you as a photographer the next time they need images.
I know this was a long post and while not all positive it is constructively offered to share my personal experience as a fashion and glamour photographer with you on the topic of posing.