Nice use of fur for waving grass, but that two-tone color effect looks backwards to me.
I'm no expert on African veldt. Does the grass there grow like that? Green on the ends, brown underneath?
I'd think plants dry from the outsides in, so as the hot season begins, the grass would show dessication towards the end of the stalk but still green near the root. In the hot season it would be dried out all the way through (tan/brown not two-tone). If the wet season was just starting, the fresh stalk growing out of the root would be green, but the ends would still be brown.
I look at those pictures, I think, gee, the painter screwed up; he was going for green grass in the wet season and his paint didn't soak the fur fibers all the way through to the mat.
For this wet-season-fading-to-dry / end-of-the-dry-season look, I'd think you'd probably want a dark green fur, then coat the ends of the fibers with a tan to portray the dessicated ends of the grass. If the painting technique doesn't penetrate all the way to the mat, as with this painter, that would be the right way to go. Basic wargames painting: dark basecoat, lighter highlighting.
Both links posted by LawOfTheGun mk2 look better. The fiber is one uniform color all the way to the roots, then sometimes highlighted at the end with a lighter color.
