Our contributing editor Tony Langley has a wonderful collection of graphic art that supplemented photography in the publications of all the belligerents. Here are some selections from Tony that range from (what's called today) photo-realism to fiction and from serious to silly.
A French Poilu Gets a Hot Meal
A German Depiction of Defending Against an Attack
A French Drawing of a German Shrapnel Shell
A Deep Dug Out
Sink a Lot of Ships and You Get Chicks