Not a bad evening's work.
Filler applied to the steep hill and the edges of the field/plantation bases:
And the flat bases (for villages, scrub/rocky ground), gully and gentle hills have had grit and sand added:
Tomorrow night I'll be sealing the grit and sand with diluted PVA, then will paint them on Wednesday night. I'll be adding grit/sand to the dunes and fields/plantations as well.