Artist. On her pixiv profile page, she wrote her opinion about re-uploading her images.

Japanese name: トヲコ (Towoko, the artist uses this spelling: "towco")
Site name: ORANGE★BiTch

See also

• Home page: http://id50.fm-p.jp/317/orangebitch/
• Blog: http://blog.livedoor.jp/orangetowco/
• Gallery blog: http://blog.livedoor.jp/orangetowco-pict/
• Pixiv account: http://www.pixiv.net/member.php?id=2297400
• Pixiv novels: http://www.pixiv.net/novel/member.php?id=2297400
• Privatter account: http://privatter.net/u/OrngTwc
• Twitter account (1): http://twitter.com/OrngTwc
• Twitter account (2): http://twitter.com/0rng10c
• Booth web store: http://ringorange.booth.pm/

(The artist has a real person fiction-themed site, too. It is not related to danbooru, though.)