I would like to comment on your picture, purely because sharing opinions help us to ''see'' a picture differently from the way we have chosen to take it or present it.
I agree that the picture leans more towards ''fashion'' , rather than architecture or portrait, although t can be all three with clever use of the environmental space and deep understanding of a person's psyche, tastes or inclinations. I look at the hook and the implied metaphor. Probably it could work better if the model was to pose of the other side of this metal pillar.
A photograph is our attempt to catch the light or display characteristics of people or objects with it at a very specific point of time. Our frame is an amount of space where light and shadow should help each other to be displayed and come out effectively.
I think the current framing, posing and stylistic selections do little justice to the potential of the space and the model.
Framing-wise, the bright top part of the image, above this horizontal pillar, seems to be an excess, which offers little, if any, interest to the picture with the addition of a grey sky. The abolition of this space, would help our eyes focus in other bright areas, with the biggest one being the spot where the model has posed. In addition if helps creating a ''closed'' frame where the feeling of entrapment, enslavement or potential torture (due to the hook) is carried easily as a metaphor. Further cropping of the 2 most right pillars helps creating a composition of 3 verticals where the poser is almost in the middle, thus is clearly noticeable. Same-wise a slight trimming from the bottom at the bases of the pillars (which vanishes the lightly coloured path) closes the ''entrapping'' space holding the poser tightly. I understand that my cropping suggestion may imbalance your play of thirds there but I think the rules are not there not to be broken, they are mere suggestions which here were not fit for the concepts you seemed keen to explore.
Posing, apart from facial expression, which I like for not looking at the lens has to do a lot with the positioning of the body and I suspect here your model is standing on the wrong foot. The current positioning of the right foot hides the high heel of the shoe on the left leg, alike with the big grey strut on the pillar base which hides the heel of the right foot to be seen. It is again a play of light and shadow or silhouette which could make this more edgy. My suggestion would be to keep the left leg straight and bring the right foot backwards close to her bottom.
I shall agree that the top garment may create a thin figure but the amount on white at the back is almost lost in the grey background. The length of the blouse at the back covers a very nice line of her figure, shame. A monochrome black blouse might had looked better especially if the hair on the left were brought in the front too. A smaller ''frame within a frame'' could have been created if the left arm was closer to the top of the head.
I know that working with a professional model may be an expensive exercise therefore I think that careful planning and even sketching of the poses could address such issues early so your time is consumed in great shots.