I created a Devonian looking armored fish creature for this illustration. I based the creature loosely on the Dunkleosteus. The University of Michigan Museum of Natural History in Ann Arbor has the skull of a prehistoric armored fish. I saw it when I was a kid and it left an indelible impression.
Here are some sketches I created over the week. They are my standard fare of robots and monsters. The private eye and monster drawings look like something out of the fear-drenched universe of H. P. Lovecraft. However, the monster could pass as a mutated creature from Super Mario Brothers.