I think like weathering and panel lines, there are two trains of thought here (even if many don't actually think about it consciously). For one, there is making it as accurate as possible, as if you scaled down the original. In this case some details you notice up close on the full size subject would not be visible at scale and from scale distance.
The other, perhaps more artistic train of thought would be accentuating an effect. The latter being a caricature for sure, but making a model interesting by drawing attention to an accentuated detail that the modeler would like a viewer to notice.
The model builder is of course, free to decide.
Myself, I find artistic license to be a lot more fun. :)