ok so I have watched both the LOTR and Matrix trilogies before. I have just recently rewatched Matrix and only after this post have I realised that Elrond and Agent Smith are both portrayed by the same actor...
Watch V For Vendetta next, also Hugo Weaving. In that film, he does an excellent job of portraying emotions from behind a mask. He does a better job from behind a mask than a lot of actors can do with their entire face.
Kate Sackhoff said she really enjoyed the challenge of Bo Katan in season 3 of the Mandalorian for the same reason. Portraying emotions through body language and inflection alone is such a different experience for actors and it takes real talent to pull it off.
Arwen died of a broken heart soon after Aragorn's death (in Lothlorien, Elrond having sailed West soon after the end of the war, knowing his daughter was lost to him forever, just like his brother centuries past).
Died died, human-like, no Halls of Mandos for her.
Being Elrond's daughter, and thus a direct descendant of both Eärendil and Beren and Lúthien Tinúviel, she could choose the fate of elves or men, and did so when she married Aragorn.