Hi Isabel ~ I just took a quick look at your shop, and my first thought is how busy your backgrounds are. You want your buyers to focus on what you are selling, and not what the background looks like, or worse, how distracting it is!
I think a background that is an earth tone and much lighter than the item you are selling will make your items 'pop' off the page. For example, a pale orange or pale brown.
Also, since what you are selling are card and scrapbooking embellishments, what about including them on a card you make, or from a scrapbook page you've made (or just go ahead and make a card and scrapbook page for people to see?)
What you're selling is really cute, and will sell here once your photos have been worked on. The photos themselves are nice and clear, and show off the details of the item, it's just the backgrounds are too much!
You want your items to sell themselves, not fight for attention with the backgrounds!