Hi ..Anyone who scratch builds terrain has my admiration, Its not easy !
Using cheap / scrap materials aswell is great.
I now find myself buying resin buildings and converting / personalising them rather than scratch building because I crave the finer details and
overall look of a table rather than the pratical gaming value of it ! My bad!
Some of my terrain has become more like a static model railway display
than a gaming set. I miss making my own creations and must get back to
it !
For hints and ideas about details.. I would recomend re-watching all them
western films and concentrate your attention on the backgrounds and sets,
this terrible chore? :

: will give loads of inspiration for details that
make a piece just that little bit more believable. Old photographs and
pictures are also a good source of inspiration.
I:E
http://www.archives.gov/research/american-west/#townsI'm currently trying to work out how to show meat and poultry hanging
outside my towns Meat market.
But remember that you are only trying to give an impression of something
rather than a complete miniature reproduction ...or you'll drive yourself mad !