Here are some ways to make your store even better and make people want to purchase.
Product Page Feedback
Your store just needs some tweaks to take it up a level. Hope you found this helpful, if so please click "like" below to let me know.
Your site is nice and clean which helps navigability. I agree with @DuaneBrown 's points and would like to add that it would be a good idea to add a bit of personality to your site. Right now, it's a bit plain and hard to know who you're selling to. This is a great article on how to add personality.
Also, I think I'd put a banner image at the top of your site here:
Currently, it's a bit jarring to jump right into selling without an interesting image to capture the user's eye first.
The About Us text "Our inspiration mainly comes from the trends in lifestyle, fashion and interior design. Many of the posters and art prints in our selection are sold exclusively here" lacks inspiration. Try to think of a more compelling way to write about what your brand is about, consumer's will be more interested in your products if you are enthusiastic and truly interested in what you're doing.
Why did you choose the products and subject matter you have?