Koyuki - Moka Akashiya from Rosario + Vampire

Moka Akashiya is a cute and cheerful member of the newspaper club at Yokai Academy, but when the rosary around her neck is removed her true nature is revealed - that of a powerful vampire. While 'outer' Moka has pink hair, 'inner' Moka has silver hair and red eyes. Inner Moka's personality is much colder, although throughout the series she develops a genuine attachment to Outer Moka's friends. Her good lucks make her popular with the male population at school.

Cute cosplay by Koyuki a Japanese cosplayer. The costume is lovely and the photos are perfectly set up to compliment it. You can view her cosplays at:
Facebook Fan Page
Her blog
Fansite