I used to photograph beauty models a few years ago. What I would say is this: showing your products worn by models is important, but then it becomes really important to make sure you use the right model, pose her correctly, and get the right facial expression.
I like the model you are using, but she is working better in some pictures than others.
This is a good one - a mysterious and alluring facial expression:
http://www.etsy.com/listing/110052872/bracelet-glass-purple-beads-silver-metalThis one I'm not sure about:
http://www.etsy.com/listing/108538772/beaded-necklace-with-butterfly-pendantShe still looks pretty in the second image, but the smile distracts the attention a little, and makes the picture feel more like a portrait than a product shot.
If you're not sure about how the model looks in a particular shot (for example you don't like a facial expression but think your necklace looks great), you could try cropping the image so that you can see it's being worn, without the distraction of the face. I see you've done this in a few of your pictures.
I put a treasury together this morning, with some beautifully posed models. Some of them may give you ideas about how to create a mood in your pictures:
http://www.etsy.com/treasury/MTcwMzI4NTV8MjcyNDAwMTk1Ng/second-summer-of-loveI hope this helps!