My mother pointed this out to me. (I have two Super Junior posters hanging in my bedroom; one of SJM’s Perfection and one of SJ’s Bonamana.) She told me how Kyuhyun (her favorite member, lol) is always looking away from the camera.
She’s very observant, she analyzes all these things. She says Kyuhyun is camera shy, Siwon’s movements are all premeditated, Sungmin is always showing off his aegyo (of course, she didn’t use that term herself) and usually, it’s only Ryeowook, Donghae or Eunhyuk who pose casually. Lol, I’ve managed to recruit my mother as an ELF after making her watch EHB with me. We both agreed that it was hilarious and educational!