Nagomiko : http://www.nagomiko.net/
For Comiket, he always sells his old/new Artworks & Goodies. He's mainly an independant illustrator for magazine, so you can find easily his artworks about Canvas, Utawarerumono, To heart 2, etc... It's really worth to DL his wallpapers.
Nishimata Aoi 西又葵...