First, I would add more items. This will help a lot, especially if you want to start promoting. You kinda want to be "fully stocked."
Also, for your photos, if your going to have them be modeled on people, have them take off other jewelry. It can be confusing if someone searches for a bracelet and they see a guy wearing that and a watch.
And read up on SEO and join SEO teams. Yours needs work.
But to get to your original question: Promotion. For social media, I personally like Twitter and Instagram. You have to use social media constantly, but about an 80/20 mix of Behind the scenes/Fun stuff than 20% promotions. Than you can also reach out to fashion/jewelry bloggers or podcasts to see about getting featured. Also try selling at craft fairs/farmers markets.