First time seeing this. She looks really impressive. I love the natural looking body she has and as someone said, far too many figures have that "need to be fed look". All of Pz99's suggestions came out great. That belly button is looking much better for sure. I like the face as is ( lots of character ) Please don't make the nose pinched and tiny leave that up to morphs.

Phantom's rigging looks great as always. I like that she is light in geometry. Im no expert on rigging, In fact I know very little but I find that figures tend to deform much better if they fall into the mid range of geometry 35 to 60,000. Also it's much easier to create morphs for, faster render times etc. basically optimizes everthing. When she is released I would like to have a go at making some morphs for her. I was going to suggest Blender to you which I like to use for morphs but I see you said you have Zbrush and Wings3d so I think your covered.

Cheers
JB