A keying master's help I need

Hi everyone,

I am in some serious keying trouble. The subject had a really bad hair day, I guess.

I tried the inbuilt keyer and also Phyx keyer but my results were unsatisfying. I have to admit that I am not very experienced at keying, so far I get along quite well but now I reach my limits.

Is there a trick on how to work with this hair? Several layers of keys or so? I am super thankful for any advice!

Enjoy your weekend!
Sebastian

Here's a link to a better quality image in my dropbox:
dl.dropboxusercontent.com/u/2207321/Keying%20nightmare.jpg