I never get why Morinth looks exactly like Samara, but then Rila and Falere just look like normal asari.
Because that would’ve been effort? I have no idea either, but it bugs me enough to think about it.
My current rationalization is that while Morinth really took after her mother, Rila and Falere took after their father more.
My mother looks like the double image of her own mother, but her sister doesn’t.