I mean this in general when you first see an idol or a group what's the first thing you pay atention to in their visual ? For me its their style ( clothing , shoes , hair )
The mouth. I was attracted to Kyuhyun's lips, stragely And Taeyong's smile on their 1st WI made me stan him After that, I'm attracted to their hair...
Sense of humor. This one is very very important. Overall it's personality I notice first. And if I like the personality, I'm bound to like the looks. Those two are very connected for me. If I only glance at an idol I just notice his or hers general good looks, can't really pin point one thing. But that doesn't get me interested in them just because they are generally good looking. I need more depth to get attracted. Also I instantly check their height if I get interested. It has a lot to do with me being insecure about my height, tho I don't really care if the idol is taller or smaller than me, it's just a reflex, I guess.
eyes, hair and clothes/fashion.. but im also considering the way they are performing esp during live performances