There were at least two more RM illustrations by this person, but waybackmachine did not archive them.
http://www.twoirons.serio.jp/gallery/galerie-rouge/006-kirakishou.html - "Son Monde Blanc"
http://www.twoirons.serio.jp/gallery/galerie-rouge/007-hinaichigo.html - "Dans la Lumiere Orangee"