That last pic isn't really of what gamers classify as "Zanzibaris." Ujiji is on Lake Tanganyika. Those guys are probably better characterized as "Ruga Ruga."
Well done on finding veil pics. I knew somebody would! Never seen anything like that before. Shows that it isn't always wise to speak in absolutes.
That first pic is quite interesting. I wonder if it is based on anything real, or done from the artist's imagination? I only ask because I don't fancy a horse's chance of living very long in Tanganyika. It's nearly impossible to keep horses alive in that region, or so I've read, due to the tsetse fly. The East African Mounted Rifles in the Great War became infantry in quite a short time. Whether we can trust it or not, I'm not sure, but it is a very cool pic, anyway.