Mr. Karate is excellent but he needs his hair combed backward like in MI2/FFWA or KoF in general instead of his extemely goofy CvS hairstyle.
Viper.... Seems just off to me. Too wide, odd lighting/colors, face not defined enough (CvS actually makes changes to let you see the face much better - see Joe & Benimaru compared to their KoF stance)
the face thing also goes for Killer Bee, her fist hiding her jaw is exactly what won't go in CvS, and same for SF4Cammy - head is just getting too small.
Rufus's head is just a little odd - should be shaped like a gourd, not like a balloon.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.