I agree. The Peter Jackson trilogy pretty much nailed it imo.

One thing I found interesting though in reading was that Gollum says that Sauron has "only 4 fingers on the Black Hand." So he must have some kind of physical form at that time.

And I'm quite certain Aragorn was meant to be beardless because of his lineage. I wonder what this AI based some of it's decisions on if it became "more unpredictable" the longer the description was

Sauron did have a body. Gollum told Frodo and Sam that Sauron had FOUR fingers on one hand. Then, he continued one saying that the FOUR fingers were enough and he shuddered. Gollum had been taken to Barad-dûr to be tortured for information by Sauron, so clearly he had met the Dark Lord in the flesh. How is that possible if Sauron did not have a body? “‘ 𝐘𝐞𝐬, 𝐇𝐞 𝐡𝐚𝐬 𝐨𝐧𝐥𝐲 𝐟𝐨𝐮𝐫 𝐨𝐧 𝐭𝐡𝐞 𝐁𝐥𝐚𝐜𝐤 𝐇𝐚𝐧𝐝, 𝐛𝐮𝐭 𝐭𝐡𝐞𝐲 𝐚𝐫𝐞 𝐞𝐧𝐨𝐮𝐠𝐡,’ said Gollum shuddering. ‘And He hated Isildur’s city.’” - The Two Towers. Book 4. Chapter 3: The Black Gate is Closed -

But such a cool and knowledgeable nerd. Nerds rule!

Frodo is 50, agreed, but the book also explained he didn't look like that due to the ring.

This! Thank you! Came here to write exactly the same thoughts. Frodo has always bugged me from the fist day I saw him in the trilogy. I got used to him, but if the artist wanted to show how Frodo really looked like, he's make him older, not a pre-teen! I mean - has he even read the books?

Frodo was *supposed* to look young instead of his real age. The Ring preserved his youthfulness. Aragorn was supposed to be beardless. There was a passage in LOTR where Aragorn visited Lothlorien, Galadriel gave him elvish garments to wear, and he looked like an elf-lord from the West. Not possible to look like an elf if you are bearded. Moreover, Tolkien specifically wrote that men of Númenórean royalty ancestry are not capable of growing beards in the Nature of Middle-earth due to the elvish strain in their blood which was dominant and enduring. “As time went on, people began to notice that 𝐅𝐫𝐨𝐝𝐨 𝐚𝐥𝐬𝐨 𝐬𝐡𝐨𝐰𝐞𝐝 𝐬𝐢𝐠𝐧𝐬 𝐨𝐟 𝐠𝐨𝐨𝐝 ‘𝐩𝐫𝐞𝐬𝐞𝐫𝐯𝐚𝐭𝐢𝐨𝐧’: 𝐨𝐮𝐭𝐰𝐚𝐫𝐝𝐥𝐲 𝐡𝐞 𝐫𝐞𝐭𝐚𝐢𝐧𝐞𝐝 𝐭𝐡𝐞 𝐚𝐩𝐩𝐞𝐚𝐫𝐚𝐧𝐜𝐞 𝐨𝐟 𝐚 𝐫𝐨𝐛𝐮𝐬𝐭 𝐚𝐧𝐝 𝐞𝐧𝐞𝐫𝐠𝐞𝐭𝐢𝐜 𝐡𝐨𝐛𝐛𝐢𝐭 𝐣𝐮𝐬𝐭 𝐨𝐮𝐭 𝐨𝐟 𝐡𝐢𝐬 𝐭𝐰𝐞𝐞𝐧𝐬. ‘Some folk have all the luck,’ they said; but it was not until Frodo approached the usually more sober age of fifty that they began to think it queer.” - The Fellowship of the Ring. Book 1. Chapter 2: The Shadow of the Past -

The Nazgul are described (rather vaguely as I recall) when Frodo puts on the ring and sees their faces on Weathertop.

Sauron did have a physical form according to letters Tolkien wrote to friends, but he deliberately didn't describe Sauron's body because it makes the idea of his menacing presence across Middle-Earth more powerful storywise. Whatever shape he had would, IMO, probably be pretty fragile given how much of his power he'd already burned up over the centuries. Duder's spirit barely escaped the destruction of Numenor, and Tolkien wrote in correspondence that it took Sauron longer to achieve a physical form after the Ring was cut from his finger and he was killed than it did after the sinking of Numenor.

My thinking is that it takes a 3D AI to properly figure out where the eyes should be located and what they would look like under different lighting. I think these are based on more 2D look which is why areas with depth (eyes, nose) look strange and wonky.