Yep, makes perfect sense.
The Manyema sculpted their hair into "cones", "plates" and "flakes" using clay. The cones are reasonably similar to the ones in this pack -
The sculpted hair is lightly-hued in the picture, I think meant to be the colour of the clay, rather than the hair itself. The loin-cloths these guys are wearing look about right, too.
This is the kind of shield they used, it would seem (described as similar to Mangbetu shields - the Mangbetu painted their shields with designs like the one my figure below has, but I don't know if the Manyema did the same or not):
Finally this guy's hair is almost identical to one of the examples of Manyema hairstyles, except the one in the picture has no feather:
Hope that helps.