I think there are at least two painters who worked on the VMS. A sloppy painter and a more careful painter who respected lines a bit more and mixed colors a bit more often.
So, I was wondering, was the painter (or painters) a decision-maker or simply someone who followed instructions?
I have a feeling at least one of the painters (maybe the careful painter) was a decision-maker, not just a production-line worker.
VViews pointed out that a line had been added in the Pisces fish figure in paint (not in the drawing). In most areas, the line connecting the two fish mouths was traditional.
Here's another example. The illustrator did not draw a star for this particular nymph on the Gemini folio. There isn't even a left arm to hold a star. But the painter added one anyway (along with a line):