org.bukkit.material.Skull materialSkull =  new org.bukkit.material.Skull(Material.SKULL);

materialSkull.setFacingDirection(BlockFace.EAST);

do

materialSkull.setFacingDirection(BlockFace.WEST);

and

materialSkull.setFacingDirection(BlockFace.WEST);

do

materialSkull.setFacingDirection(BlockFace.EAST);