Artist, illustrator.

Japanese name: まよこ (Mayoko)
Circle name: コペリトール (Coperithr) (reading is a best guess)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=66620
• Twitter account: http://twitter.com/ma_45
• Twitpic account (server stopped): http://twitpic.com/photos/ma_45