Overall I think this is very pretty.
I love the warm glow, and I like the light and shadows, except for what seems to be natural light (?? Is this what's called Rembrandt? I'm not sure) on the right side of her head. It's a little distracting.
Also, perhaps try getting the necklace in focus too, as this would make for good fashion or product photography.
One more thing, I know this isn't "critique the model", but a little less eyeliner, or even smudging it a bit, would be very pretty on her, I think. Also, perhaps having her tilt her head up slightly would reduce the dark shadows under her eyes.