Prisoner

This is a very beautiful portrait. The choice of clothing, pose, lighting and expression flow very well together and was a great choice.
What caught my attention was her pose. It is so different and I do not see that pose very often within portraiture work. It must have some sort of symbolism. Her arms are in a "x" shape and her expression remains very serious. It looks like she is against something or maybe even mad at something or someone and trying to 'x" it out of her life.
Another thing that caught my attention was her outfit. It is amazing. It is so vintage and it makes the whole photograph look vintage itself. The blue skirt contrasts with the greys and greens within the image and it stood out so much. It also compliments her skin colour.
I have a few suggestions though that could have made this image have more impact:
Do you see that black pipe by her feet? it slightly distorts the elegance within this image that you were trying to portray. It disracts us from her very nice shaped legs. Make sure, for further portrait work, that you carefully check your frame and make sure nothing is in the way of a great sight.
Next thing is her foot work and leg positioning. I can see up her skirt a bit. Was this intended? becuase often within portrait work, sometimes this is intended. If not, a better foot and leg positioning would be in order. Her feet look very twisted and her legs are being squished in to a sharp corner. You have to give your model some space and work with your composition. Maybe have her lean on a more flat surface or have your model stretch with more grace without being on a surface. There are many poses you can work with and there is nothing wrong with trying different poses, taking many shots and chose them later when you are uploading. That is what digital is for.
All in all, this is a beautiful portrait of this girl. You complimented her wonderful shape and her pretty face. The clothing, lighting and pose match so well.
Just watch your composition and frame. take your time with your shots and have fun.