Here are some lovely Nubian Bowmen from the world class Perry Foundry range. Detail is just wonderful along with variety and poses. The Fan Bearer is from Dark Fable Miniatures. Although much bigger I feel he fits in as large bodyguard type allowing more character to the unit.
These 2 bases can be 2 Impetus or count as 24 man unit for other systems. Using only 18 figures saves painting, and cash without sacrificing look.
These can be used as units in Egyptian armies also and have less Egyptianised Kushite look.