French Soldiers of the Great War

I bought these compelling photos at an auction about ten years ago as part of the "contents of a drawer". I return to them again and again. I've found very little information about them as the names are so hard to read. The rotund fellow from the 54th Artillerie is the focus of the photos. I've tried to get in touch with descendents who may have an interest but to no avail.
 Still beautiful after 140 days on the campaign. December 12, 1914.
Just look at these guys! The stories they could tell. This one's titled After lunch at Bayonvillers, January 1915. Lignon Senior, far left is the father of Lignon Junior, far right. Lignon Jr. died during the war and was buried at the Locre Cemetery in Belgium.The other man with the fine ears is called Moreau. Our fellow is called T.(or F.) Duroy or Duvoy. Bayonvillers is village east of Amiens, about 20km south of where the Battle of the Somme took place.
Taken Monday night the 18th of December, 1916 by the fellow on the far left in the picture below. Members of the 54th Artillerie and PAD 28 pay a visit to Madame and Madamoiselle de Labeniere and Mademoiselle de Finfe. Lignon Senior is seated at the left. Moreau is at the bureau behind him. Our soldier is at the vitrine behind Mlle. Finfe's head.
An interesting picture of a canal barge named Old Arras. Barthelmy, on the left,  took the photo above this one.
A very gloomy shot of soldiers transporting guns. My cavalier is sitting high in the saddle on the left. There are explosions visible on the horizon.
A mysterious photo captioned Breakfast in l'acayuna. I've tried to find that word but I can't. If that rings a bell with anyone please let me know. I'm pretty sure they are in officers quarters in a trench or near the Front. Dr. Sasportas is the doctor of the group.
This one's captioned He sprawled a Bergere.  Bergere, I think in this connotation refers to the chaise lounges the soldiers are recuperating on. I don't know if this is my soldier or not. The patients are being treated to a musical interlude.
I'd be greatly interested if anyone out there could add anything to these scenarios. I've been unwilling to share them until now because they are precious to me.
All photos are property of Hazel Smith. Please seek my permission before using.