Make a swastik on your door step a day before they come. Clean your mandir, hang paan leaves tied to string over your main door. When the pictures arrive sit them on a small stool (bajot) outise your mandir, wash them with Milk, water, honey, water, ghee, water, suger, water and apply tilak to them place them in your mandir and offer dhoop and deep.
Good Luck
Jai Mata Ji