Certainly there would have been methods available even then to either overlay changes (~cels) or exactly reproduce a base image (xerographic). I’m just impressed even using tracing he didn’t just 1:1 reproduce the same scene, tiny variations exist (nose shape, left fist, V-neck shape etc.).
Digital copy and paste wasn’t really much of a thing in 1983.
FWIW he almost definitely traced it.
Certainly there would have been methods available even then to either overlay changes (~cels) or exactly reproduce a base image (xerographic). I’m just impressed even using tracing he didn’t just 1:1 reproduce the same scene, tiny variations exist (nose shape, left fist, V-neck shape etc.).
This was aligned against the dog: