Very pretty model and I like where you were trying to go with this. But the harsh lighting especially noticeable on her arm really detracts. Also, I think the composition really prevents us from focusing on her face and eyes, which really is what makes a woman sexy in my book. I think here instead, the composition and lighting make the primary focus her open jacket and her bosom.
in reply to one of the comments the definition of Vamp = A woman who uses her sex appeal to entrap and exploit men.
In British English and traditional American English usage, a tramp is a long term homeless person who travels from place to place as an itinerant vagrant, traditionally walking or hiking all year round.
I assume the version of tramp that you talk about is the following , swinger: a person who engages freely in promiscuous sex , now why would you think that , wishful thinking ?
Because of how dark her attire is, a white background might be more appropriate to help separate her from it. Her expression looks slightly uneasy and awkward.
I read the title and you completely lose me. Not that it had much to go on in the first place. There should be more contrast or at least a highlight along the hat so the viewer doesn't lose it into the background. It appears to be direct light which loses any depth of character. .... The Vamp. I would like to ask what here makes you see 'vamp'? Though I also need to ask what do you think a 'vamp' is? No judgment on the model, Or attacks, just observation of character portrayed within the image... The Tramp, may be a better title. More believable because of the wardrobe choice. Remember this has nothing to do with the model personally, only the visual of the image in front of me.
Your model didn't feel very comfortable, I'm afraid. Make her smile next time. Lighting is a bit harsh, try a reflector from right side. besides that, a black bra would have fit better.