Done this exercise just to get back on my feet.
I started doing it for the patterns on their skin only, but then i imagined the colors and soon i was also concerned about the shapes. I started looking for interesting patterns/shapes on existing animals. 2nd row 3rd head is heavily inspired by antelopes, 2nd row 4th started out as crocodile-ish, and midway i looked up butterflies. 3rd row 1st head is fully based on butterflies. 3rd row 4th head is based on horses, and 2 kinds of goats (mountain goat and markhor). 4th row 1 and 2 and the last head are based on crustaceans, especially on one that i didn't even find a Wikipedia article about (Acanthonotozoma). This is just a fraction of animals i referenced.
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