Similar shading? Only if you want it. But if you're practising portrait-making, but you don't want your image to look like the one you're copying then it won't be a great practice, since the the whole point of making a portrait is depict someone as close to her real look, right? (this also applies to changing the details on the face and nose.
From my experience, the really important thing when making portraits is to be able of distiguishing the features that diferenciate that particular person from all others. The shape of the nose, opening of the eyes, size of the lips, etc...these and all other features are diferent in every person. All you've got to do, and, unfortunately, it's not that easy, is to find what features, among each and everyone, make that epole special.
Anyway, I did an edit for you. It is not yet rendered, but if you wish you may do that yourself. It's mor to show you where you failed volume-wise.