Also, true, but these are Realms (D&D) elves we are talking about, and they have been very thoroughly described and illustrated for abour 30 years now, and one of the biggest reasons why they don't just look "like beautiful humans" is, that they are literally alien to Abeir Toril... like dwarves, they have no genetic ancestry with the planet's native humans, hence why they only vaguely resemble them, at most.
Contrary to, for instance, LotR, where the ancient Elves basically originated all intelligent live... even Orks and Goblins.
If you've been paying attention to illustrations in DnD you'll know that no two editions have the same kind of art style, and even within a single edition you'll find a wide variety of depictions, and no two are identical.
Look at the depiction of Drizzt on pg 21 of the 5e PHB, compare to the elf in pg 25, the one on pg 44, the bard on pg 51 (this one is a half elf I think), then you have a moon elf and a wood elf druid on pg 64 and 67 respectively. The ranger on pg 89 and the rogue on pg 91. Then we have another two spellcasting elves on pg 138 and 169. They all look, with like one exception (pg 138), like humans with funny ears and strange colours... But they're all slightly different in style too. The elven faces in BG3 are, afaic, elven enough for me.
FWIW Humans are just as much planar interlopers as the other races. It is vaguely implied that the original humans came from Earth (see the variety of human mythology represented - everyone from Tyr, Tymora/Beshaba (who together were originally the Greek goddess Tyche), practically the whole Egyptian pantheon (Sharess = Bast, for example), and gods from the Babylonian pantheon etc). Humans can also breed with elves to produce fertile offspring (half elves), which implies they are much closer on a genetic level than you'd think.