Alphabeasties and other AmaZing Types by Sharon Werner and Sarah Forss is absolutely excellent! It's full of animals that are illustrated using many upper- and lower-case letters in different fonts for each letter of the alphabet. And, at the bottom of each page, there are examples of "fancy" or different ways of writing letters such as "... lower-case a can wear a little hood," and the D'Nealian lower-case k that "has kind of a knot"
My favorites are "C" (camel) and the "D" (wiener dog), and "O" (octopus, owl and ornament). The book had several fold-out pages, great color and rich language. If you have a preschooler learning their letters, get yourself a copy of this book—pronto!!