Quote - Well one thing I can say is that as far as really good resources/ multiple shot nude photos of the same person tend to be much more accessable for caucasians. I find one ethnic fully nude set of body and face shots for every ethnic one.  The lack of these photos might be one reason for the reduced number of 3D model textures and merchant resources that are ethnic.

That's a very fair point.  But most of us can't do anything about photo resources.  Most of us can, however, make materials that work with darker textures, fix hue and saturation problems in Photoshop, correct burned in artifacts, and eliminate texture features that don't fit the intended ethnicity very well.  There's no dearth of free online references for most ethnicities.  One or two good photos and some time in Photoshop and the material room can help correct a lot of problems.