Most of the sculptures (and most of the characters of a mural) are designed to be hung on a single loop of wire that is placed on a single finishing nail driven into the wall. Many people go no further than to hang the pieces this way. If a permanant installation is required, all the mounting loop locations are marked on the wall and wall anchors (that are used to mount the art to the wall) are installed at those locations.
Installing A Wall Sculpture
Example of an installation instruction