Has it occured to anyone that these all might be the same guy?
http://www.sharecg.com/pf/full_uploads.php?pf_user_name=oppok
http://www.sharecg.com/pf/full_uploads.php?pf_user_name=oppos
http://www.sharecg.com/pf/full_uploads.php?pf_user_name=oppop