Ellen Pompeo in Grey's Anatomy?

I've noticed a difference in her face. In series 1-2 and beginning of 3 she looked like this: http://www.greysanatomyinsider.com/gallery/morose-meredith.html and then rest of series 3 and 4 she looks like this: http://www.greysanatomyinsider.com/gallery/closed-circle/ I wonder why... She looked much... show more I've noticed a difference in her face. In series 1-2 and beginning of 3 she looked like this:
http://www.greysanatomyinsider.com/galle...

and then rest of series 3 and 4 she looks like this:
http://www.greysanatomyinsider.com/galle...

I wonder why... She looked much nicer in the first seasons, don't you think? Especially because she looks the same when she's on her own, look:
http://justjared.buzznet.com/gallery/pho...
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