The Division is quite a bit bigger than this - these are just the recently based or painted units. Most of the rest are finished but not quite accessible at the moment - it's a decorating thing.
Every Division has a unit of cavalry 'scouts'. In the case of the Ptah Division they are mounted on Garrison horses.
And the main infantry force consists of Nubian/Kushite archers. Being the last unit based, these are the 'poorer' painted/condition figures in the Division. Others include this lot.