Always an interesting artist. My favorite of his was 'Amazonia Gothique', used on the cover of White Dwarf 79. Interesting to see that someone made a minifig of it:

https://distopus.blogspot.com/2018/04/amazonia-gothique-john...

Some of his art can be seen here: https://www.goonhammer.com/in-memorium-john-blanche