Bonjour IIbunny. The artist of your profile image is "かんじゅ (Kanju)", pixiv ID=2496550, HERE. Original of your profile image is this. One of 27 images of "PuriPara". The artist of your avatar image is "うさ城まに (Usa-shiro Mani)", pixiv ID=7367, HERE. Original of your avatar image is this. The title of picture is "ぽにょん (Ponyon)". The next url is the illust site of Usa-shiro Mani - "Usacastle" (rabbit castle). http://oasis.mani.daa.jp/ . There are many rabbit girl pictures. "daa.jp" shows it is the "Lolipop rental server" domain. See HERE. _mrd
[edit]: Note: THIS is the full-size image of the PuriPara picture.
[edit]: Note: THIS is the full-size image of the PuriPara picture.