I thought it might be useful to show some links to photos of Zama I found on the interweb, which explain why I've made the terrain colours a bit muted (some might say a bit grey!).
Here's the approach to Zama at sunset:-
And this picture, in particular, is very much what I'm trying to capture:-
The field is slightly browner than mine, but appears to be an umber-type shade. I wanted to achieve a very dried out , dusty post-harvest look. In hindsight, I could have bunged a bit of yellow ochre into the mix when highlighting, which I do with the mix I use for basing. I'll need to work in some clumps of dark green vegetation. If anyone could whip up some trees looking like those, that would be very helpful!
The below looks like it is taken much earlier in the year, as it is a lot greener, but appears to include an olive grove (I have one on order):-