^ Everybody's saying that they (the topless pics) are intended to show that she's being reborn and free, after tiring 8 years as an AKB48 member. Maybe she's trying to get rid of it, her AKB48 image, and by releasing this photobook, I think it's like a kick-off before her journey to become actress.
^ Yes, I'm aware of that. When she was still in AKB48 and she did those shots, all I thought was, she's bold that she do this (compared to other members), and I can tell that she's quite confident about her body. But I think the fact that this photobook is released after her graduation and her first as Oshima Yuko (not AKB48's Oshima Yuko), is perhaps the main reason this gives off those vibes more (the reborn and free thing).