Check my tread here about Roxie meets Blender Chapter 1 and chapter 2.

I did the whole face and body, still not finished, but I could not find symmetry errors at all.
only a small problem in the upper lip.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!