Hi Patrick
You mean the trees
These are Heki 1630 and 1670 series mounted to real busches not Photoshop
for
This technique
I practice to use the guaj -waterbased-oil paint
first I paint the roof with the guaj color brown
than clear the color excess by a piece of cloth in direction up to down
Than as you seen in 1st picture painted with oily color
Than by hand and piece of cloth clean the paint immediately
Down parts with a small sponge applicated use Tamiya weathering powder
regards
a.usta