Minecraft wiki entry for Hangable, associated text:  Facing: The direction the painting/item frame faces: 3 is south, 4 is west, 2 is north, 5 is east, 1 is top, and 0 is bottom.
 TileX: The X coordinate of the block the painting/item frame is in.
 TileY: The Y coordinate of the block the painting/item frame is in.
 TileZ: The Z coordinate of the block the painting/item frame is in.