Lovely stuff, Gerard. You have a great 15mm set-up. I love 15mm and usd to do a lot of colonial games with Principles Of War rules in this scale, before my poor old eyes told me 28mm was better. No need to apologize for using 15mm
However, if I may add some constructive criticism, the ground looks too bare and desert-like for Zululand. There should be more grass and, depending on the season, this could be any shade from straw-yellow to grass green. Southern Africa is often very verdant and having clumps of trees, bushes etc and patches of long grass would make your games look even better.
Dewbakuk is right though, you need a lot more Zulus. "Black as Hell and thick as grass!" is the look to go for
Please keep posting your pics