the most obvious reason for slow sales to me would be the seasonal effect at the moment. Summertime isn't really noted as a tea drinking time in the USA, so buying Teapots probably isn't on many to do lists. Then on from that, you're not just selling a Teapot, you're selling a Tea set, so a different market again to some one just wanting a normal pot.
Combine that with the ornate design, which would seem to me to be aimed at a more elderly female demographic and a bit of a picture is starting to emerge. You really have a product that is aimed at a very small demographic, and I have to ask myself how many elderly woman are shopping on eBay?
So for me your market is mostly a gift buyer, someone who would buy it to give as a gift to someone. I would think that would certainly be your main market at the very least.
Your low feedback probably isn't helping, but I doubt it's a major factor to be honest. I think the bigger issue is the combination of all that above that I have highlighted.
So how do you increase sales?
Well I think your pics are fine, but I think you should work on your copy. You have to sell the product, make someone want to buy it, nit just sit it there and hope they buy it. Build a story around your description, elaborate how wonderful this set would be to entertain friends for morning tea, perfect to relax in front of the fire and so on. Try and put pictures in buyers heads buy giving them great scenarios that they themselves might not even consider.
That will also then give you a more lengthy description, which always looks far better than just a quick couple of lines. Short descriptions like that almost make it seem like you just don't care about the product you're seller and if you don't car, then you have to ask yourself why a customer would care?
If you can find a safe packing method, I would also consider international sales as there are much bigger tea drinking countries in the world than the USA and it's always Winter somewhere in the world, so you automatically increase your chances of sales.
I would recommend taking the "best offer" option off the product. That just makes it look over priced to start with, so then people start questioning themselves as to what it's really worth, is it just poor quality that you are trying to get rid of. That's not a game you win easily, because most won't make an offer, most will just walk past once they start thinking like that.
Some other ideas, what about packaging with some different types of tea as well. Something a little exotic that can't be found at the local supermarket. If you're already making money on the teapot set, then you can bundle the tea itself with that at cost to make the deal more attractive. You may also want to consider putting a wholesale listing on eBay as well, sell them off in some volume to clear some stock and develop some cash flow.
Anyway, a few ideas there for you.