I like the idea that Annatar crafted himself a new body specifically to charm the pants of elves and men and then had these really awkward moments of vanity, like,
"Why yes I am quite handsome, thank you for noticing. You like the facial symmetry, do you? Oh that’s all finishing stuff. You should get a look at my skeleton! Some of my best work, that skeleton."
"…As usual, no one at the party commented on my chromosomes, or perfectly replicated human digestive system. Philistines.”
"What’s my best feature? I’d have to say my nervous system. That’s fiddly work, I don’t mind telling you!”
"I hope they notice my optimized shoulder-to-hip ratio…"
"Oh look at that I’ve gone and spoiled my best liver. Damn it all, that took weeks to make!"
"I almost didn’t bother with the appendix. ‘Leave it out, Thû!’ I said to myself. ‘Not going to be eating grass anytime soon, are you, Thû?’ but then I thought— go on. Treat yourself. Have an appendix! Why not? You’re worth it."
That has something to do with the reason why the LOTR book has so many appendixes.