I wondered about all the pictures and the statues of the „virgin Mary“ in the pictures I found.

The cult of Mary had helped form the Luxembourgish identity in the 17th century and then in this time of war and deportation people turned to her again for consolation. There was even a statue that the Luxembourgish people had asked to put up upon an altar in one of the churches in Boberstein … so during that time far away from their country they still had a place to worship their patron saint.
And the only picture put on the walls seems to be always of the Virgin Mary …

http://www.institutgrandducal.lu/Joomla/index.php?option=com_content&task=view&id=44&Itemid=91

https://de.wikipedia.org/wiki/Muttergottesoktav

http://web.cathol.lu/990/paroisses/porverband-notre-dame-limpertsberg/cathedrale/la-consolatrice-des-affliges-die/article/die-verehrung-der-trosterin-der

http://www.cathol.lu/evenements-phares-grouss/octave-oktav/article/entstehung-entwicklung-und

http://reader.digitale-sammlungen.de/de/fs1/object/display/bsb10022957_00003.html

http://www.wort.lu/de/lokales/keine-oktave-ohne-o-mamm-leif-mamm-4f61d962e4b0860580ab0ea8