Lets take the picture above as an example. This is one of the items you have in your store ~
To find people that would be interested in buying these, You could try the following:
"Retro pearls"
"Pearl Brooch"
"I love brooches"
"I love pearls"
"I want a Brooch"
"I Love Vintage pearls"
"Vintage pearls"
For each of your products, think to your self, ~what could a person say that would be interested in the item~If it is vase, people who are talking about vases will at least look at your tweet and some might buy your product. It's a numbers game, some of your items will be easy to find target audiences for, while others may be more difficult ( Like a brooch... haha)
You have to market each product separately to find more people. But when your looking at those tweets, Keep following anyone who mentions any of your keywords , You can follow 999 people a day on twitter, DON'T Follow 1000 or you get flagged. ( Been there, done that, many times over)
No one said it was going to be easy. It does take some effort on your part, but the pay off is huge. Even if you do not make even one sale from twitter, The SEO benefits to your shop and listing will be higher then your competition and you will make sales from Etsy. and people finding you at the top of the search engines.
Be sure to follow as many people as you can. once you do this for awhile you get really good at it. The longer you do it the easier it gets. as your social presence sores, The amount of effort needed to maintain it drops.