Are you doiong ads for your whole shop, or just items that aren't getting views through search? If you're doing your whole shop, I would suggest focusing your efforts on just items that aren't already getting views. Otherwise, you're watering down that $10 or $20 worth of impressions on items and keywords that don't really need help.
Second, I would take another look at your tags. Your purple wavy bracelet for instance (very cool btw!). You have these key words:
Tags
Jewelry
Bracelet
Chainmaille
chainmaillers team
chainmaille bracelet
coiled chainmaille
jewelry for women
purple waves wavy
wavy jewelry
purple silver
purple coils jewelry
funky chic
everyday wear
colorful jewelry
silver chainmail
unique strange
Some of your tags are right on target, like 'silver chainmail'. But, a lot of these will probably never get searched for.
For example I would never search for 'unique strange'. I also wouldn't search for 'wavy jewelry' or 'purple waves wavy'.
And, you're missing some really important ones. For example, according to google's keyword tool, Chain Maille (two separate words) gets 75,000 searches a month. 'Silver Jewelry' is another high traffic search term that you could easily use.
I hope that helps some! I think there are some people having really good success with search ads (and I hear pretty lousy things about showcases...) so if you can make it work for you, I think it would be a really great too to get more traffic.