Hi,
a friend directed me to this blog post about WW1 professional combat art.
In World War I, the US War Department commissioned eight professional artists, made them captains in the Army Corps of Engineers, and sent them into the war in France. There were six illustrators: William James Aylward , Walter Jack Duncan, Harvey Thomas Dunn, George Matthews Harding, Wallace Morgan, and Harry Everett Townsend; one architect and etcher: J. André Smith, and one gallery artist: Ernest Clifford Peixotto.
Together, they produced over 700 works, from sketches to fairly finished paintings, in four basic categories: daily soldier life, combat, the aftermath of combat (ruins and damaged towns, etc.) and the machinery of war.
Here's the link to this blog where you can find the link to see the above mentioned works, should provide plenty of inspiration for scenery building
http://linesandcolors.com/2015/05/25/world-war-i-professional-combat-art/