Artist: unknown artist
Either the artist signed with a squiggle, or there was no name on it, the uploader did not provide the source, and/or used an unclear tag and did not set it as an artist tag. Remove when the image gets tagged with the artist's name or nick. Source link is only to assist finding the original source image, not to ascertain the artist. Commonly the poster is unsure or just lazy.
Not to be confused with anonymous.