Taki switching ethniciteis
It seems in each new soul game, her eyes get bigger and her face kinda changes. In part 2 her eyes were bigger. In part 3 in the artwork she obviously looks Japanese, but take a look at the new Taki in this pic for part 4, she looks Caucasian.
http://media.ps3.ign.com/media/739/739576/img_4702899.html
I think she looks really pretty in the new one, but she doesn't look like Taki, but she looked best like herself in Soul Blade in my opinion.