Hi Christine! On the one hand, I think your photographs are stunningly beautiful (and so is your jewelry). And because your jewelry is inspired by nature, it's definitely fitting. And I like the fact that not all of your items are photographed on the bird nest because it lends variety to your photography (something that MY shop is sorely lacking).
On the other hand, it does require a shopper to look more closely to distinguish the jewelry from the background. However, I think it's ok, as long as you have other photographs of the piece without the bird nest, which you seem to have in at least some of the cases.
That's my two cents. But I'm new, with no track record, so what do I know? :)
One thing I'd like to see, as a customer, is the jewelry on a model, so I could get a better sense of what it would look like on.
Great stuff, great photography, and overall beautiful shop!