Perspective Tool For Realism

I paint a lot of houses, most of them wood siding style, with boards running on the horizontal.
A time back, I discovered that drawing the lines if wood board siding all on parallel made
for unrealistic-looking buildings. The aid I found was a simple solution to the problem.

On any perspective -correct piece, you must decide where the horizon line lies. This done,
the board-siding on a house is angled slightly upward, if under your horizon line, and slightly
downward if above your horizon line. This takes some practice to get things to balance on
the horizon, but it is worth doing.

I know most site owners at FAA already know this perspective fact. But to many newer
artists, well, we have a lot to learn. To them....and all.....tips are always welcome !!