How do you "aged" the miniart ruin house or building?
I try mist it with tamiya light gray.But I am not so satisfied with the result.any solution?

I'm working on the Italian Village House. We don't need no stinkin' h-airbrush! Far from finished, but ..... Stones were painted about 9 shades of grey, then washed with thinner with a hint of flat black, then a wash of"sand". Door was painted Russian tan, a wash of black/brown, dry brushed with "portland stone". Handle bracket and bolts done with a small drop of rust. All done by brush.

There are some useful video tutorials on their Website using oils as a weathering "tool" over the base colours. Whilst they use AB to apply those base colours in places, no reason that it has to be done that way imo.