To me their hair used to look better maybe all of the heat is taking a toll (or it could be since they have a better camera now I can see their hair better). Im also not loving the layers they have now their hair is starting to look slightly like a mullet with one drastic short layer in the front and then long in the back. The twin on the rights hair (Kendra I think) looks shorter on the left hand side like it is breaking.
Video from Oct 2011 their hair looked better here
http://youtu.be/m8tW9waxW-A