Then, there's the fact that the illustration was done completely from memory.
Last year, our colleagues at Gizmodo showed how Korean artist Kim Jung Gi could create impressive illustrations without prior sketching.
While serving in his country's armed services, Kim was able to work with a wide variety of machines. His art shows a deep understanding of how things work and a knack for getting that understanding down on paper.
But the cat and the dog people? Those he did not encounter in the military.