I had already answered by meh, I have other things to say!
I think when it comes to face shape, which is quite important to look feminine, Keira Verga is very high up there. She has a thin face, thin jaw, and I'm always amazed at how feminine her face looks (even more so in selfies and stuff like that than in her official contents).
I already had people asking me who was the girl behing the face when I had a pic of Keira in my signature/avatar, and they weren't into tgirls!
Breasts, I think Kalindra Chan has one of the most natural-looking fake boobs. This is an amazing job done here.
Voice, I don't hear much from the girls. I would need sentences to really have an opinion. But when it comes to moanings, I've never heard better than Keira Verga. She has a few videos (sex with a masked manwhen she moans, and she definitely sounds like a woman! Quite incredible. Her voice when talking is very good too, although I did not hear her a lot.
But I agree that voice is important. A great looking girl with a voice I don't like won't do it for me.
Overall looking, dressed and all that, Amy is always a reference. I have a few pics that would mostake anybody to think she is not a genetic woman!
I like tgirls who looks really feminine, but natural too. Yeah I know it's hard! I like girls natural, not with tons of make-up, fake parts of body and too elaborated clothes. Same with "special girls". That's why I love Keira Verga so much, even though I think it's a bit overdone in make-up and clothes in her official content (but hey, it's often that in porn). And I prefered her with her natural breast too.