Hi Joe.
Don't worry about the brushed on cammo, as Matt has mentioned, this was often how it was done in the field.
The green and brown cammo paints (also the white winter cammo) were supplied to units in the form of a thick paste in tins. The paste was designed to be diluted with either water or gasoline prior to painting/spraying on the vehicle.
As is so often the case with front line units, the stipulated mixing ratios, etc, were often overlooked or ignored due to pressures of time, availability of paint (the white seems to have been hardest for some units to get hold of for some reason) and doing things "by the book" was far less important than doing things to suit the circumstances.
A look at reference photos shows many examples of vehicles with brush painted cammo, some even look as though the paint has been literally thrown on and others look as though the crew were trying to produce a modern art picture!
One last point, as I said earlier, these paints could be diluted with either water or gasoline and depending on which was used and how much they were diluted by, would effect the final colour. Anywhere from a light redish brown or light green, to an almost black brown or green could be considered correct.
I hope this helps, and congratulations on a good looking model.
Richard.