Fandom artists draw a brown-skinned Idril, who 'was called Celebrindal, the Silver-foot'. They draw a brown Aredhel, who 'was pale though her hair was dark'. They draw brown Morwen and Túrin, although 'he was in truth the son of Morwen Eledhwen to look upon: dark-haired and pale-skinned'.
All of these are exact quotes from the Silmarillion. Let alone Beleriand in the Age of the Trees, when THERE WAS NO SUN yet some assume Elves could get a tan. Did those people even read the book? Do canonical descriptions matter less than fawning over minorities?
By the way, 49% of my town's population, most people at my college and workplaces, and everyone 'cept me in the house I rent are from visible minorities. Was I ever racist to any of them? Nope. I'm all for diversity, but this fanart just looks so forced. As if you shoved European characters into some Japanese fantasy that takes place in the Heian Era. The funny thing is... Silm/LOTR artists who are non-white (Chinese, Japanese, Korean, Indonesian etc) don't give a damn about 'diversity' and just draw everyone looking like pale Europeans (or pale mukokuseki if anime). Pixiv offers a good representation.
So as not to be baseless: here are the quotes from the History of Middle-earth and Unfinished Tales.
Noldor in general: fair-skinned
Sindar in general: appear to have very closely resembled the Exiles, being dark-haired, strong and tall, but lithe. Indeed they could hardly be told apart except by their eyes
Yavanna: her face was very pale for the greatness of the effort that her being put forth
Estë: the pale
Melian: her skin was white and pale
Elu Thingol: Thingol's face with wrath was grey
Lúthien: white pale hands
Daeron: Dairon the piper leant there pale
Finrod and his ten companions: fairskinned, brighteyed
(dead) Beleg: white face
Gwindor and Túrin: their pallid faces
Finduilas: wept in secret, and she grew so pale that folk marvelled at the whiteness and delicacy of her face
Nienor: stood pale as a wraith in the moon
Tuor: fair of face
Voronwë: his face was pale with dread and loathing
Maeglin: his skin was white
Earendil: his skin of a shining white
(wounded) Ecthelion: whose face was of the pallor of grey steel