Joshlobo: I insist in my point of view: details are not the most important thing. What makes a model worth it's its gesture, its beauty, the time spent make it looks great. In this challenge for example, there are two guys, Swankymonkey e Legolas_hv that are doing a great work only with Maya. Their models are much superior and expressive than mine. There's other important examples, like Lord of Rings, Spiderman, Ice Age, Final Fantasy, Shrek and many other productions, which have a high level, of production, in every aspects, and were done using Maya only.
The point is: if you're a good modeller, dont't worry! ZBrush won't cause any damage for you. Models done in traditional way won't die because of ZBrush. People use to do excelent work on disp, color and bump maps with Photoshop for a long time, and they will still doing.
Athos: Thanks for cheers. It seems there's a misunderstood here. I didn't abandone my original model. The head I've post at last was only a STUDY. I did in Zbrush because is easier and faster to use, and I needed to understand the mistakes I made on the first model. Briefily, I will post new shots of her face in Maya.