I think there is a solid base of faces already, as i understand it the whole setup is basically a mix and match of eyes, nose, mouth, face shape, and hairstyle yes?
I think the current eyes, nose and mouths are fine as there are hundreds of possible combination out there, they just need to be expanded to include some Asian type features. Other then that i think all that would be needed is some more variety in the hair styles and add some face shapes to include some facial hair similar to many of the African decent face shapes already in the system.
I have no doubt that there are plenty of BuzzerBeater members out there capable of helping with this project who would gladly do it free of charge, I for one would be happy to assist. If you were to release the original art to a small group selected to work on the project a couple of guys could work on adding facial hair to some face shapes, a couple could work on new hairstyles and a couple could work on adding Asian facial features and it would take no time at all to complete....