This is just my personal desires and I'm not trying to diminish what other people are feeling. I would support changes to models to maintain their original feel. Except for the eye lights and glowy ears.

-

General - I love the new eyes! They are leagues above what we currently have. They'll look amazing in proper non-benchmark lighting.

Elezen Male - I really love the long dramatic, dark lashes. I like how they smoothed out the faces because that is how I always envisioned my particular character.
The glowy ears are absolutely amazing and if they take them away because a few people dislike them (light shining through ears like that is always red/pink - observe black cats) I will be actually super disappointed.

Miqo'te Female - Big win. Personally, I think every Miqo I've seen is just a flat upgrade. My best friend has a Keeper face 4 Miqo and, besides the fangs, she's over the moon (ha). She's so in love with her girl and I agree. Her character is extremely cute now.