If you try sometimes
After long years, he's getting soft, getting old, and even if he still is decent in shape he knows it, so Sauron smiling, comes to his "old friend" who is sitting angrily in the corner of his practice room, after ordering his trainers out, because he just realized that they're holding back out of fear of hurting the old king. And now? Now is the time when Sauron whispers--"In Valinor, great king, there is no death..."
(Sorry. It is a good piece, I agree! And visually depicting Ar-Pharazôn's aging, especially in contrast to Sauron as an immortal, would be important.)