Teachings of the Unwashed Paintbrush.

[Bluetoes101]

Ones off the top of my head
You are not allowed to view links. Register or Login to view. is one I questioned previously, where it looks like this may have happened. 
f70v1 - weird light green headwear at 3 o'clock
f67v1 - Various yellow, green, to mucky yellow-green stars

I'm guessing there's a lot, if people really look. The main thing for me was trying to decide if green (not mucky green) "skin" meant "serpent-like" in animals - snakes, lizards, dragons and so on. I don't know where I stand for original or much later, but there was very probably more than one painter in my opinion, and also reasons to believe they were not the same person as the drawer/scribe. The reason why this might be interesting is paints getting mixed "The Unwashed Paintbrush", if green seems very neat and blue messy, maybe the dirty green is "blue guy" doing yellow too, rather than green, which would point to multiple. 

Don't know really, but an interesting topic. My intuition is that much older talk of "the dark painter" (Bob ross is batman?) probably has some truth to it and there are multiple painters, of which maybe we can see who did (/messed up) what. Your example shows this blue might = yellow painter well.. the annoying thing is mucky green could be caused by green+yellow or blue+yellow.. it is interesting there seems to be very little orange though via this dirty paint brush.