I've got six:
Noh Face from Spirited Away, first row, furthest right
Majora's Mask from LoZ, first row, second from the right
Hallow mask from Bleach, third row, furthest right
what I'm assuming is a Spy, bottom row, furthest left
Haku's mask from Naruto, bottom row, furthest right
annnnd Garrus Vakarian/a Turian from Mass Effect, top row, second from the left
I keep thinking I might also see a an ANBU mask from Naruto, but I'm not sure. Three other ones look very familiar to me as well.