1) None of the background-cities had those V-shaped incisions in the crennelations (is that the right word?) of their walls - not one! All had the simple rectagular waveform. Can we conclude that the VMS author had nothing to do with Flanders or the Netherlands?
Our VMS author was definitely a part of his pictorial environment and age. He was not a great draughtsman, but he was true to his prevailing iconographic culture. (I will regret this definitive statement later :-)