I'm working on identifying the sources of the images I based these on. I don't have all of them yet (unfortunately) but I'll collect the ones here that I know for sure.

Luttrell Psalter
14th century Hours of Charles the Noble, King of Navarre
15th century Pontificale Romanum
15th century Theological Miscellany
13th century

A big thanks to Weird Medi-eval Guys (on twitter) for their work in this field.

PS. If you're interested in the art and history of illuminated manuscripts, check out indie narrative game Pentiment!