an example (Praxian, to keep it on topic):
We often see the birds eye view of Pavis (not the map, the drawing). It is iconic. It is "canon" (and has been for nearly 40 years).
It is also doesn't make sense, if we consider we are supposed to be in a Bronze Age setting: those walls are so anachronistic IMO, looking like something from Harn rather than Glorantha. it also doesn't really square with how it was described in the text.
Roger Raupp redid them slightly on his amazing River of Cradles cover. Now it reminded me of the castles of the Holy Land, but still not Bronze Age.
Damn, but it was an amazing piece though. Look at how the Zola Felli fish. I so wish we could get Raupp back, his covers were so evocative, and really shaped how I saw Prax.
Jans cover for Pavis, is probably my favourite piece of Gloranthan art.
Of all the art done of Pavis this most sums up how I see it: the colour, the architecture, the teeming masses.
But I image the walls of pavis look more like these: