Hi! Overall I think your shop looks great! You've got a lot of variation between bold color and more subtle designs. I also like that you've used multiple photos in each listing, thats key for SEO, and I see a lot of people who sell prints that only show one photo (which will put you lower in the search results).
I might recommend creating a logo for yourself rather than using a product photo for your picture. I saw you have a banner image, maybe take the same elements from that and create a square image for your logo?
I also would show some close up shots of your prints, so that buyers can see the detail of some of the patterns, watercolor flowers, etc.
Also, make sure your title matches your keywords, and think about what a buyer might be searching when they are looking for a print. People will search things like housewarming, housewarming gift, gifts for her, etc. There is also a site called Marmalead where you can check how your keywords track on Etsy (the free version gives you a lot of good information)
Disclaimer--I am also brand new to selling on Etsy, but I think most of what I suggested is also what I've seen other people do/say. Hope that helps! :)
