I don't know the artist, the image is a character from a eroge visual novel game (there was an English translation patch in the work, and so far no one said they stopped working on it, but they started working on it since 2009 and the last update was in 2011, so I assume it won't happen)

Anyway, you can see several pictures of this particular lamia it here:
http://gelbooru.com/index.php?page=post&s=list&tags=lamia&pid=560
(the link should have gotten you straight to page 21 but if it didn't, it's on page 21)