I have not investigated the blue paint at all (except in reference to some of the plants), so I can’t comment on that. Readers are encouraged to reference your blog as it looks like a topic worth discussing.

My blogs are always on the long side and adding another 40 references really bogs it down (and sometimes gives away something I’m still investigating), but the c. 1262 Austrian zodiac (possibly from Salzburg, which I think was transferred further east to Seitenstetten) is Morgan Ms M.855. When you see it, you might recognize the “turtle” Scorpius as similar to the one by Hildegard von Bingen. Also, Cancer is a crayfish. Unlike the VMS, however, Sagittarius is a centaur with a longbow.

Edit [addition]: I forgot to mention, I think the one from Toulouse is especially interesting as it has a longer nose than most and the line goes uncharacteristically under the bottom fish.