It depends on what would you need. If it's sprite based, on the graphic section there's this topic
where you can find people who could fill your graphic request. If that's the case, feel sure you make things clear on what you want,etc. Of course, you'd have to talk about price, because the spriters have their own life to attend, teir own projects, too, and being not known in the mugen scene would insta-throw your options. Which graphic style are you aiming for?
I swear there was something cool here!!