I have been helping startups with their digital strategies.
Looks like you have a niche product. Go find that niche market. Best way to get to target markets today is to find the same in Meetup.com I am sure you will find enough groups associated with art in there. Start posting pics and links to your store. Similarly, start using pics along with some good slogans in facebook and other social media like instagram.

Start a fb page for your store and build likes through your customers and friends. Have a console or pad in store where you can ask your customers to login and like your fb page every day after every sale.

If you are really niche with good products, I am sure you will do well.
If you need further help, please feel free to contact me.
With warm regards,
Sridhar