FYI… artists of this generation would often paint their illustration the same size as it was printed. No easy task! Medium was likely gauche on board.
Edit: I meant gouach. This is a very non reflective paint hence ideal for photographing. A few artists still work like this. Check out the work of Glenn Fabry
I loved the ‘Visual Dictionary’ of 2000s . Damn that booo is peak encyclopaedia, describing everything in amazing detail, I first read that book when I was 5. I have bought a second hand copy of that book for my future kids.
https://www.amazon.com/Stephen-Biestys-Incredible-Cross-Sect...
It was great fun finding the toilet on each and every cross-sectioned exhibit. :D