"鬼頭りん" is actually read "Onikobe Rin", not "Onigashira Rin" (nor "Kitou Rin", which seems to be the popular misreading) so the artist tag is currently wrong.
See:
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=20798379
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=19975993
Updated by jxh2154