I think there are actually sketches from the preproduction phase in the documentary. H.R. Giger was involved at the time.
There were also Midjourney images generated for 'Jodorowsky's Tron[0].
There are some Google drive links with compiled art of the movie
2 years ago or so there was a push by an nft group with fair amount of money to purchase a copy of the dune storybook by jodo that they released to studios....
But it was not meant to be, you might be able to read of it on the web
https://archive.org/details/dune-bible-viewing-alejandro-jod...
Unfortunately most video players don't let you expand the picture to larger than the screen, zoom in, or crop the image, and the image of the book only fills about half the screen so the words are not very readable. A little post processing in a video editor might solve that. Might need same AI resolution enhancement.
Just found you can play it in the Chrome browser and zoom in, but it doesn't help, the data is just not there to be able to read the text. May AI could recover it, maybe the world has to wait for a properly scanned official version.