I am really impressed by V4. There I said it.  Her shape is softer than V3's and she renders great despite the number 4000x4000 textures. 

So I went to the material room and tried to re-create her shading networks for David, and he didn't render nearly as realistically as V4 does. With the exception of the specular map (which I'm in the process of creating), wondering if anyone knows why she looks the way she does and others don't. Thanks in advance.