yamoge
Doujin novelist / fanfic story creator / writer. Usually asks other artists to draw art for his doujin novels.
He often uploads doujin cover pages and samples to his Pixiv account with permission of the real artists.
Note that most images posted on their accounts aren't drawn by him, and the doujins are usually drawn by two (front cover, other illustrations and back cover) or more artists. The commentary, image or product page will give it away, as he will usually credit the artists by either mentioning their name or linking their Pixiv or Twitter accounts. Please try to be careful and tag the original artists of the images.