I intend the following to be constructive criticism, so I hope it's taken the way I mean it (ultimately, to help).

Jewellery isn't exactly an easy sell on eBay - especially generic (by which I mean un-branded) fashion jewellery, so a really good listing can take a bit of work, but for a few general tips: 

The titles are quite sparse - you need to make as much use of the space allowed in titles as possible, as it's one of the main ways buyers will look for and find items on eBay. If you just have a couple of keywords, your listings will be lost in amongst thousands of others, and won't be returned at all if a buyer searches for something more specific. Taking the first listing ('Necklace') as an example, I would include some other keywords in the title that are more specific, eg colour, material, long / double-strand. So you could have a title (I'm guessing the materials used) along the lines of Long Double Strand Shell & Glass Beaded Necklace Silver & Blue Tones 

Jewellery descriptions also benefit from information in the listing such as measurments (length, bead sizes / dimensions, specifics about materials used - i.e. glass, crystal, shell, MOP, abalone? are the silver beads nickel free etc). 

Jewellery also sells a bit better with several, individual images that show things from different perspectives. I would also recommend doing a little editing to brighten them up so that people can get a better idea what they look like from the gallery image.