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);