Indirect Conquest

The makeup artists who created the Penguin’s look decided to move away from previous depictions of the character. Instead of just giving Danny DeVito a pointy nose, they created prosthetics to make his face look more “avian”. Additionally, they studied deformities such as curvature of the spine and syndactyly. Some comic book artists (such as Tim Sale) subsequently drew the Penguin as “deformed” in different Batman comics.

(Source: filmtrivia)