Here are a couple of boards with the first highlight. I hope to apply a very sparse second highlight, tomorrow. The colour I went for is a sort of raw umber with a bit of tan in it. It looks a bit grey in the photos, but it is slightly browner IRL.
The boards will look (somewhat) less austere when the fields and tufts of vegetation are added. I feel an awful lot better about the project, as they are starting to look like something a man could stick a wargame figure on!