I was looking for some inspiration for a drawing - I hadn't drawn for some time - and I fell upon this amazing black and white picture of a Burmeister's Frog (Phyllomedusa burmeisteri) in a book from 1967 titled Larousse Encyclopedia of Animal Life. I was mesmerized by the shape of the frog and its contrast with the trunk on which it was standing, and how the shadows were creating a strong dramatic impact.
This is an original drawing of Rhinophrynus dorsalis!