I think this is probably just an EA issue? Agreed though, I was definitely a bit sad when I realized that Humans, Elves, Half-Elves, and tieflings all share the same body model. Isn't that probably just because the bodies are lower development priority at this point though?
Also, the female Githyanki is just the generic female model as well I believe.
Elves should DEFINITELY get their own body model at the very least, and yeah, the heads and facial hair feel way too human.