I don't really know how well art does on eBay, or whether it's a seasonal thing, but with free listings I'd say it's probably worth keeping a few up and getting a feel for what generates interest. 

If you don't mind me making a few suggestions, I would consider putting subject matter into the title, as well as your name. While I haven't followed too many visual artists on eBay, I have watched some that use original graphic art in their jewellery design, and subject matter is one of the first things that will start to draw attention, then it becomes more about artist name & style after becoming established. You might also want to consider showing a concept image that helps people place your art on their wall - there are some (free, I think) programs that can place artwork in a room setting so people can get a visual on that sort of thing. 

You have some beautiful work, btw. 🙂