Good start 
But i see that you gave the Nationals uniformly Stahlhelms and the Rebublicans Tommy helmets, nothing could be farther from history.
Both sides had a very limited quantity of helmets of various kinds (it was common practice to capture helmets) and they were never enough, most combatants weared caps or berets. And the Tommies weren't used at all.
Here is an article about helmets in the spanish civil war: http://forum.axishistory.com/viewtop...?f=32&t=157033
I digged up some illustrations:
NATIONALS

Regulars
Maroccans
Askari
Foreign Legion
Italians
Legion Condor
Carlist militia
Falangist militia
REPUBLICANS

Loyalists
Popular Army
International Brigades
Militias