Hello Elizabeth!
I agree with everyone that your cards are super cute! I also agree that some nice, natural lighting would really improve your photos and help the colors really stand out.
I'd also suggest not using the same opening for all of your titles, even if they do apply. For instance, all of your listings start out with "Handmade Die Cut" , I'd suggest changing up some of them because etsy puts the most importance on the first few words of a title, so if all of your first few words are the same in every title it limits your exposure.
This title could start with "Birthday Card" just to get you more relevant in birthday card searches.
https://www.etsy.com/listing/128642592/handmade-die-cut-turtle-birthday-card?ref=shop_home_activeSame goes for putting "Mothers Day Card" at the beginning of some of your mother's day card titles.
This one could even start as "Owl Birthday Card" because "Owl Birthday" "Birthday Card" and "Owl Birthday Card" are all well searched terms that will be utilized in that title, giving people more opportunity to see your card!
https://www.etsy.com/listing/128832977/handmade-die-cut-owl-birthday-card?ref=shop_home_activeI'm probably not very good at explaining it, so you would probably do well reading one of the many SEO guides here on etsy.
Don't worry, you've got a great product so keep at it!