Anime style pin-up specialist Shunya Yamashita ( 山下しゅんや) is an artists you may already know — becoming somewhat known in the US after the release of his art book Wildflower (his book after Sweet Dreams, followed by One Voice). Many of his pin-ups are from his original series Rick-O-Sound, but he also does a variety of fanart for Evangelion, DC Comic girls, Bayonetta, and Gurren Lagann (to name a few). Various characters from his Rick-O-Sound series have even been made into figures. He has also worked on various video games, including titles such as Final Fantasy X and Valkyrie Profile.
I am a fan of his anatomy and faces, considering how well he blends realism with the anime style. I also respect his use of traditional mediums.
For Yamashita’s site: http://shunyama.web.fc2.com/