Welcome to etsy, Egan! As I looked at your shop, I have some hints to help with getting your shop found here in this online world. Take this listing for example
https://www.etsy.com/listing/195566103/spray-paint-on-posterboard-planet-family?ref=shop_home_active...All of your titles are the same and probably not something customers would search for - always think like the customer and use aspects of your painting for your titles ie: Moonlight Landscape Art Print, Planets in Space Painting, etc. The first 40-50 characters of your titles are what search engines pick up so make sure those words/characters tell the customer what you are selling.
Restate your title in the opening sentence of your listing - reworded in a pleasing manner to entice visitors to read on. Be sure to incorporate the key words from your title throughout your listing description.
I noticed in your materials list you use magazine pages...your description doesn't say anything about how you incorporate those pages into your paintings. Try to make sure that each aspect/material you use is described. Customers like to hear the process you use to create your products.
Tag words are very important in being found. I always list my tag words in the order of my titles and always use multi word tags.
Backlinks keep customers in your shop. At the end of your listing invite them to look at another painting and post the page link to that product.
Your paintings are very nice and very unique! Keep listing new paintings as the larger your shop the greater the chance of being found and garnering sales. Hope some of these tips help!