The scene is created by Eddie Bennun.
Take a look at this awesome World War I-inspired concept art created by Eddie Bennun, Senior Art Director at Ubisoft.
The picture is called Rainy Morning and was made using SketchUp and Photoshop. The artist first set up a rough 3D base, then used some photobashing and painting on top.
Bennun has some more personal projects in a similar style:
Eddie Bennun has worked on several Assassin's Creed games, including Valhalla, Origins, Rogue, Black Flag, and Liberation. He was also a Concept Artist for the Prince of Persia Classic HD Trilogy and an Art Director for The Division 2.