This pattern is different than the other Little Mermaid doll pattern by JanaGeek. This pattern is only available in a kit, not online. It has a bigger head and a smaller body than the JanaGeek pattern.

As a helpful reference, here is a list of the yarns I used to make the doll pictured in the “Disney Princess Crochet” pattern book.

Ariel: 
Lion Brand Vanna’s Choice Solids in Scarlet 
Caron One Pound in Cream
Red Heart Super Saver in Paddy Green, Honeydew, and Orchid

Note: After the book was published, Caron altered the color of the One Pound in Cream yarn (it is more yellow now), so I have switched to Hobby Lobby’s Crafter’s Secret in Magnolia.