I just realized this, but I think Hiroaki's character artwork seems to have been thought of as being a team illustration rather than a single character illustration. The Ikari Team, for example, has Ralf and Clark back to back in similar poses, both the Fatal Fury Team and the Benimaru/Duolon/Elizabeth team have a central character and one character leaning towards each side, the Psycho Soldier team has Athena in the middle and Momoko and Kensou to the sides in similar poses, etc, etc.
I don't think it's ever been handled like that before. Hiroaki is the man.