I dont think Vieras needed changes at all. As one of newer races, these looks much better than other races graphically, also looks good in most ingame lighting settings. But agree, that older races needed the graphical uplift, specially hyur and lalas.
As for viera, in my opinion it is downgrade. Did not needed changes at all
My character also looks totally different, and no free fantasia will fix it. Cannot make her same in dawntrail benchmark because of limited char creation options

-eyes, -lips -makeup, everything looks slightly different and combined all together with new lighting engine it makes a totally different face