Anya:
In highschool Anya's hair was mostly brown and started off in a bob.
Anya's hair is getting lighter and longer.
In season 4 Anya's hair grew back and much longer.  It was also a lot darker.
Ok, another bob, interesting...
In season 5 Anya has a nice bob with some cute curls in the front.
Later on in season 5 anya's hair gets a bit longer and more curly, very nice :)
Straight again...
Curly again...
Shorter and more curly...
Late season 6 Anya's hair is sleek, straight and lighter, this is probably my favorite Anya hair do so far.