Thanks Smuli! Yea they mainly use the soft round a chalk brush, a few of the more foliage heavy ones uses some custom ones though. I will probably try to be a bit more experimental though
I agree with you crit for the matte painting WIP, the destroyed holes have a long way to go, there are going to be light sources from within the building such as fires or lamps etc so hopefully they will bring out some definition and make them the main focus point.
The matte painting WIP uses mainly one photograph for the base plate, with another sky photo and some other small elements. From this base plate some elements where taken out before any painting or other elements were added.
il post up a step by step when its done