The Interweb Fails?

In Amsterdam, I saw this painting I really, really loved. They didn't have any books or postcards of it there, so I made a mental note that the name was something like "Dragoon" and looked it up when I had internet. And couldn't find it. Thus, when my mother went to Amsterdam a couple weeks later, I asked her kindly to check the artist name and the full name of the painting for me so that I could track it down. And she did - "Dragoon on Watch" by Rene Pierre Charles Princeteau. Armed with this information, I went to try to find a picture of the painting. And I still can't find anything. Internet, why have you failed me?

Apparently, Rene Princeteau was a deaf-mute painter who was a friend of the Toulouse-Lautrec family, taught Henri to paint. He liked to paint animals and military subjects. And the only painting of his I can find pictures of is a portrait of Toulouse-Lautrec. Damn you Van Gogh Museum for not allowing me to take pictures!!