Thanks for comments, guys. In fact, I was surprised too, to see ZBrush was allowed for a Maya competition, even for displacements. In part I agree that is a great advantage having ZBrush to do details, but In my point of view, what do a model a REAL GOOD model isn't details you can add in ZBrush, but the main structure of model, its proportions, gesture and so. As you can see, I'm not a great modeler, in fact I'm just learning how to do that and how to use Maya and ZBrush. I don't believe I'll win this challenge, I'm here more to learn and have some fun with my model. And I'm using ZBrush only for disp not modeling. As you can see I did all modeling part in Maya. And I don't believe I can be a menace for anybody here, so don't worry, buddies!
I will do more sketches to make a try in fixing or restart modeling again, to do Michelle looks a woman.
I appreciate your comments very much. And thanks, Kiveun, for the tutorial.