On the web I came across a collection of 102 photographs of Zouaves in the front line, dated winter 1914. The collection was named "Photos du Front de Joseph Lavieuville".
Here are two.
Of note in the first photo is the racial mix and the adapting to the weather with the wearing of sheepskin jackets. The lower is one of the best portrait photos I have found.
I don't know who put the collection on the web, but if you read this blog, thank you.