Speed painting seems to be the name of the game. I have managed to blast through both units of zombies far quicker than I could reasonably have expected.
Despite the speed I am reasonably proud of the results here. They are a testament to the impact of the current generation of washed (devlan mud etc) on how quickly you can get reasonable results these days.
Next in the queue are four balefire catapults which will give covering fire to the rest of the army.