Social media is a great place to get the word out about your handmade cards. Whether it's Pinterest, Facebook, Instagram, or another outlet, you have a tremendous opportunity to reach a wide group of people the world over. Look for Facebook sales groups, which are groups that allow selling to members. Some groups do not allow selling and you will risk coming over as spammy if you post in these groups without permission. Do a search on Facebook for Etsy groups. There are plenty to choose from. Instagram can also be a great place to show your work, just make sure that the link in your profile is to your store.
If you are going to cover a range of cards and styles you will have a range of target markets and you will market-specific groups of cards to the relevant target market. Knowing your target market also helps you with marketing. If you know who this demographic is, you are much more likely to be able to reach out to them directly with your marketing efforts.
Have I made my point yet? They are not kidding when they say bioDIVERSITY. There is literally every form of living thing available to choose from. Butterflies and water fowl, more frogs, turtles and lizards than I ever knew existed. Weird fancy pigeons, big and small game animals…it just goes on and on and on. The only bad part is you can’t search for specific images but hey, it’s free!