She's quite nervous and reticent right now but at the same time seems to be very determined she doesn't let those nerves actually defeat her even though you can see them on the surface. Also the things she's said makes you think she's planning her rise a lot, like already saying she'll graduate from MM when she's 24 to become a TV announcer.
A lot of MM members wear contacts I think. Fukuhime and Ayumin usually wear glasses at home iirc and Harunan was putting on her contacts in that new year dokkiri.
On Kanna and Koharu... Yeah I can kinda see it. It's the mouth/lips I think... both have rather disconcerting smiles imo but they do have that model-like look. Well, in Koharu's case she is a model now though heh.
Now that I think about it, the way they're both hyped up at the beginning of their career feels kinda similar too. I wonder what is it with the Japanese media and this type of look...