I find this unfortunate, because it seems that he was both good and versatile, as we shall see from the images below. Biographical information of a limited sort can be found in English here, and in French here.
These three formal, commissioned portraits indicate what Flameng painted and suggest why he was hired to do so. One curiosity: Every subject is posed directly facing the artist and viewer. Makes one wonder how their noses were shaped.
This was either a modest commission or a painting made on the initiative of the artist. Yet another full-face view, this showing narrow-set eyes. Nevertheless, a pretty portrait of a believable lady.
Interesting sort of landscape here. It has something of the character of an illustration. That might be because Flameng actually was an illustrator as well as a fine-arts painter.
Speaking of illustration, above are some of many works by Flameng when he carried out his duties as a war artist during the Great War when he was about 60 years old.
Probably a late work. No face-on view here, and plenty of the subject's character showing. Too bad more portraits aren't done in this sort of way.
Another apparently late painting. Wish I was there (then or now!).