Street Fighter IV concept art (from PC version of Street Fighter 4)
(Thanks to MGBenz for ripping the art and to Kung Fu Man for the submission)
Abel, Balrog (aka Vega), Blanka, C.Viper (aka Maya), Cammy, Chun-Li, Dan, Dhalsim, E. Honda, El Fuerte, Fei-Long, Gen, Gouken, Gouki (aka Akuma), Guile, Ken, Mike Bison (aka Balrog), Rose, Rufus, Ryu, Sagat, Sakura, Seth, Vega (aka M. Bison), Zangief…
…and various other character designs and sketches.
This one is not ripped from the game but was posted on the SFIV Developer Blog: