I recently bought some digital stamps on Etsy from Pretty Grafik Design. There were so many cute digital images to choose from and they were so inexpensive too! The set was only $.99! I suggest that you check out their shop because, it is loaded with adorable images of all kinds.
To create my cards I combined the mermaid images I purchased with some stamp sets from Lawn Fawn. So Jelly includes the starfish and the squid and Year Six features the adorable clam.
Each mermaid has Wink of Stella on the scales of her tail. It was hard to photograph but, they look so sparkly in person.