Japanese name: ワモツァ2 (Wamotsa 2)
Old name: ワモツァ (Wamotsa)

Pixiv account: https://www.pixiv.net/member.php?id=39128535
old Pixiv account: https://www.pixiv.net/member.php?id=28382082 (Still available, but the artist states that the email was lost, and can't log into it.) 
vampire (artist)