Artist name: 後藤なお (Gotou Nao)

He has been largely inactive since 2009. While he does keep a Pixiv account and does still post pictures on occasion, they are mostly old pictures.

The artists Lucie and Moo may be his former assistants/apprentices and members of Galaxy's Child. Their art style is very similar to his, especially Lucie's, so much so that he and Gotou have been mistaken for being the same person.

Home Page (defunct): http://www.st.sakura.ne.jp/~galaxy/
Pixiv account: https://www.pixiv.net/member.php?id=653980