Yeah his other works are good too. That first one in particular though to me really captures a sense of innocence combined with curiosity. I get the feeling that she is 13-14 and still developing physically, looking into a mirror and wondering what it all means. Perhaps it hits me just right because it takes me back to my own childhood.
Be warned, a bit NSFW and that sites anything but E for everyone to browse, but the comment on that one seems relevant here. http://danbooru.donmai.us/posts/1520517
Ok...uhh...well this thread is about navels so I don't know why it should be limited to humans. Maybe there is some artistic license regarding navels anyway.