At least four of them have the same voice actress in the Japanese versions.
For anyone who doesn't know, it's the second, third, fourth, and fifth from the left - Louise (The Familiar of Zero), Shana (Shakugan no Shana), Nagi (Hayate the Combat Butler), and Taiga (Toradora!), respectively... all voiced by Kugimiya Rie.
I don't recognize the ones on the far left and right, or the one in the middle.
This is great! I really like the detail of the personal belongings on the floor below them. If you were to continue on the noisy girls theme, might I suggest Haruko from FLCL? She could get pretty loud. XD