I saw that Espio pic at devianART. Did you ask the original author permission to use it? I don't want to be an ass, but if I were the original author I wouldn't like to see someone using my work without having let me know first.
Anyway, all I can say about the project at this point is that it's looking really good. Keep it up :]
Edit: Ok, I see he let you use it. Good luck with the game.