Hey bro its looking pretty cool so far, theres a few things id like to mention though:
1. i would definitely either make it male OR female, making it a half-breed or mix of the two just makes it look like you dont know what your doing. Id say go with female as it seems your most like that anyway,
2. when you establish which you want to do get some anatomy reference because although you seem to have some areas pretty accurate other areas have too much definition or are too big or not big enough.
id say work on those points and then re-post.. also is it in a suit or naked? im not familiar with z-brush but if your using mudbox you can simply put any image under the stencils folder and then paint a bump map with them from there.
I hope that was helpfull
sam