Sudanese Infantry:  It's a limited pallette!  These are the colours I'll be using:

Uniform: White

Flesh: Vallejo Charred Brown, Burnt Umber, Flat Earth, Brown Sand, White, Devlan Mud/Black or Vallejo Sepia/Devlan Mud Wash

Belts/Boots/Sling: Black

Tarbush: Vallejo Medium Fleshtone, Gory Red

Rifle: Vallejo Flat Earth/Charred Brown, Medium Fleshtone

Steel:  Vallejo Natural Steel, Black

Brass: Vallejo Brass/Charred Brown

I did two different skin tones. The one below is a base of Charred Brown followed by a mix of Burnt Umber/Flat Earth..

The next stage is a broad highlight using Flat Earth.

 Then Brown Sand is added to Flat Earth for raised highlights.