Zimraphel wrote:
(...) However, it's not true every elf has gray eyes. It's just that Tolkien was very fond of gray eyes, so he gave important characters gray eyes. Edar also have different eye colours though, for example Olwe ( brother of Elu Thingol) has blue eyes.'
Well, as with hair colour, I think the description in Appendix F need not speak for all Eldar of course, and we know it doesn't given certain descriptions. But given that it is nonetheless a very sweeping description I think we must imagine that the usual hair colour of the Eldar was dark, and the usual eye colour grey; and the Eldar being a very large group, this should seemingly translate into thousands (and thousands) of grey-eyed, dark-haired Elves. Edith Tolkien had grey eyes (or so I understand it).
That said,
Eldar isn't necessarily as large a group as some might think, because according to
The Lord of the Rings at least, the term
Eldar does not include the many East-elves of Mirkwood and Lorien, nor any of the Avari, more specifically. Posthumously published texts paint a larger picture here, but technically Tolkien had only published that the Eldar were: the Vanyar* (not named), the Noldor, and the Sindar only -- that is, the West-elves.
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*which is why Christopher Tolkien objected to the statement that the Eldar were mostly dark-haired (outside of Finarfin's house), as the Vanyar are Eldar no matter how we slice things.