Yes has to be influences from Bullshit like World of Warcraft (and I think even DOTA and cheap mobile games) and other "Dark Elves" in other fantasy worlds.

Most of the official art is still correct.
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I think dark grey is also acceptable.

But if you google Drow images then you get loads of light grey and purple colors in fan art. I mean the grey you can argue comes from half-drow but the purple makes no sense. If my player wanted to play a purple tinted half drow I would let them after all artistic freedom and such but still suspicious.