Facial feature and physique transfer by
http://touch.pixiv.net/member_illust.php?id=2813313
The green haired character is their new OC whose entire gimmick is swapping her ugly face and gargantuan figure on other girls.Unfortunately for now their other figure/face swap pictures with this character are all after shots and even this one doesn't have a ton of process.
Also there is this earlier sequence on this subject they did
http://touch.pixiv.net/member_illust...st_id=35044547