I'm about 90% sure that the last image is of Morgoth, not Sauron.
Firstly, Morgoth most famously wielded a mace (the original Grond) while Sauron didn't have any "famous" weapons. The mace here seems too featured to be coincidental. Second, the landscape seems to reflect what I would expect from a rendering of Angband rather than Mordor. Finally, the helmet appears more like Morgoth's iron crown than Sauron's film appearance (and a far cry from any of Sauron's descriptions in writings).