I found this picture after searching for best anime girl wallpaper, this is Touka Kirishima Tokyo Ghoul, one of the most favorite anime backgrounds girl. Touka Kirishima is another main character in Tokyo Ghoul - a popular manga from Japan. She usually appears with another main character - Ken Kaneki, a 19 year old university which become a half-ghoul. Tokyo Ghoul is a Japanese manga, a story about "ghoul", the creature which must consume human flesh to survive as well. On this picture, Touka Kirishima looks so cool with her "kagune", a ghoul's predatory organ and functions as their weapon and claws. The Kagune's appearance and the place of emergence on the body usually depend on various Rc type, including Ukaku, Koukaku, Rinkaku, and Bikaku.
Here are another anime wallpapers associated with Tokyo Ghoul: