I think it is quite clear that it is Nicole.
I don't mean that the other members have bad bodies but Nicole's
just has a better one.
However, I think that Hara and Gyuri are too thin, they should try gaining more weight...
I first saw Seungyeon on a SGB episode. At first I thought she was just like any other idol that usually acts cute but I got addicted to her after 3 days... I guess it's her unresistable charm XD!!
Her hair in "Jumping" was better,it was something different than her other hairstyles. All the previous hairstyles she had had this cute and feminine feel but in "Jumping" it had a more mature look.