Hi Ellie,
Your paintings are gorgeous, and perfect for summer, so I hope your business takes off. I can't offer much in the way of advice since I am in exactly the same boat as you, but I wanted to let you know you're not alone. Are you getting a lot of views? Sometimes it's helpful to narrow down whether people just aren't finding your shop or whether they look around and aren't buying since those are two very different problems. If the former is true, work on your tags and titles (though they look pretty good to me), if it's the latter then pay attention to what people search for to find you and play more with those themes. Good luck!