The Difference of the Species

I think that the majority of elves (or all of them) are fairer in face than men and they are generally taller (I think). For men perhaps these characteristics help identify the species.
For the elves, with their sight, wisdom and knowledge, perhaps they can recognise something about the person by looking at them, or looking in their eyes (-the eyes are the windows to the soul...). I always thought this from the tale of Tuor. I think it was Voronwe who thought that Tuor, the tallest of men, was an Elf-lord when he first seen him in the armour and helm of Nevrast. But when he saw his face more clearly he recognised that he was a man. The passage with Legolas and Imrahil of Dol Amroth also made me think this way.