Think about the product that you are selling. Put together a product development plan that shows how versatile your idea is. Can it grow? Does that product spawn other products or idea that can potentially sell? While simply making some cards and putting them up for sale might prove successful, you will likely need more than the initial product. A product development plan will help take out the guesswork of how to make products that sell.
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!