Possibility that the VM author was colorblind?

[Koen G]

It doesn't quite add up though. What we are missing in flower petals is yellow and pink/red. Instead, we have much more blue. With the condition you describe, the implication would be that the painter thought they were using green instead of blue, which still doesn't make sense for the petals.

Moreover, leaves are usually done in good greens. So I assume that this person knew pretty well what green looked like.