to me zbrush is a perfect example when a bunch of genius coders realize their idea in an artistic product, the output is beautiful while the workflow takes quite some getting used to.
You should post side by side your sculpt against the several images of Natalie Portman you've compiled to use as reference and example. It will help us evaluate faster.
We can't provide feedback without you posting screenshots of your model. Provide an image of both the shaded subdivided model, and the shaded wireframe of the unsubdivided model. For example:
Make your signature into clickable links. Both the portfolio and the twitter. See mine or Blond's for example. Make it super easy for people to find your stuff, remove impediments!
Just as a further example of how god damn perfect Jesse had it originally when he accused Walt, and why the exact same thing happening again triggered it
Here's an example of the scaling issues, you can see how his belt that goes around his belly is larger in game than it is in maya, it even casts a shadow.
Not sure you can apply an offset, but you can (and should) change the shader of your live object, you could have it semi-transparent for example, that should help.
almighty_gir, you have to consider there are a lot of reasons for decisions like this. One example would be gbuffer channels. Colored specular vs Scalar is a matter of 2 additional channels.
Indeed, most of the time this is the best setup to use. However I have noticed that having chrome running with a twitch stream on the side for example can still impact the performances.