I concur with 5, 6, and 8. I don't recognize the others.
Edit: Jack Palance for 8.
Getting harder but still...
David Bowie yes
John Travolta yes
Russell Crowe yes
Bill Clinton yes
Willem Dafoe, maybe no
Scarlett Johansen (sp?) no
???
Jack Palance < yes, Kirk Douglas < no, or Micheal Douglas? < no
Clint Eastwood no
Kim Basinger no
well done getting Jack Palance 
11. Ringo Starr? yes
12. John Denver yes
13. Looks familiar...
14. Katherine Zeta-Jones no
well done :)
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Getting harder but still...
David Bowie
John Travolta
Russell Crowe
Bill Clinton
Willem Dafoe, maybe
Scarlett Johansen (sp?)
???
Jack Palance, Kirk Douglas, or Micheal Douglas?
Clint Eastwood
Kim Basinger