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[LOTR] What does Sauron look like without armour?
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From the LotR Wiki:

In the Silmarillion, Sauron is described as being a shape changer, and took many forms, including that of a serpent, a vampire, and a great wolf. After Morgoth's fall, Sauron appeared in fair form as Annatar, the Lord of Gifts, and maintained this appearance until the Fall of Numenor, in which he was unable to ever take fair form ever again. He is also a changeling, in the chapter of Silmarillion, of Beren and Luthien.

A few clues are given as to Sauron's appearance as the Dark Lord: Tolkien described Sauron in one of his letters as having the form of a man of more than human stature, but not gigantic, and as an image of malice and hatred made visible. He apparently gave off great heat, so much so that Gil-Galad was burned to death by his mere touch, and Isildur described Sauron's hand as black, yet burning like fire, suggesting that his entire body was blackened from fire and heat.

Gollum, having apparently seen Sauron directly, described him as having only four fingers on his black hand, suggesting that Sauron was unable to regenerate the finger from which Isildur took the ring, similar to how the wounds Morgoth took from Fingolfin never healed.

In addition to his physical appearance, Sauron also apparently had an aura of incredible malevolence. A passage in The Silmarillion describes him as having a "dreadful presence," and daunting eyes. Furthermore, his mere presence could bend all but the strongest wills.