I like the lighting and wardrobe and expression, but do agree with tirediron that the left arm leading out of the frame (on a diagonal) is less than optimal...but, otherwise, compelling.
I tried to mimic the older lighting setups; with higher-than-normal lighting ratios, often 3:1 or even 4:1, that's what gives that look on her face, I will admit i don't remember the actual numbers probably 3:1. These were in a home studio at the time, a large room with a high ceiling. I had an enormous softbox for the general lighting, it was a 6x4, 5 alien bee 800's although for these I just used a few lights. The large softbox was straight behind me. A key light was up high to my right, shining down on her face, this is apparent from the butterfly lighting shadow on her nose. Then, a rim light was used in a cross-lighting setup from the keylight, camera left and behind to pull her out of the shadows a bit. The couch was just an old black used couch I got for the studio as a prop and people to sit and lay on.
Here's one with similar lighting, just reversed... but most of these have high ratios on the face compared to the other lights
Pretty girl. Her forehead is too hot and clipped. Better catch lights would be better to brighten her eyes. Her right arm seems to be narrowed, cut off by the black cloth. Also, there's a button along the edge of her dress that sticks out and should be eliminated. Nice shot.