My Dream Clients
Alexander Skarsgard
Kate Upton
Sarah Michelle Gellar
Ms. Queen Bey(Beyonce)
Bradley Cooper
Drake
Kim Kardashian(she needs a make over)
Nicole Richie
Paris Hilton
Courtney Stodden
Miranda Kerr
Bradley Soileau
Michelle Obama
Dakota Fanning
Chloe Grace Moretz

First to spring to mind is Jack Nicholson. 

So much character and expression, and I think he'd be a lot of fun, too.

Don't know if he qualifies as a celebrity as far as the first one is concerned but, might as well throw it in here, Charles Manson, Keith Richards or for current models - Erin Wasson

Could be awesome studies in black and white

Jennifer Lawrence
Zooey Deschanel
Emma Watson
Tina Feye
Will Farrell

Beyonce or Obama

Past and Present..............Madame Chiang Kai-Shek, Coco Chanel, Bacall, Dean, Chaplin, Bette Davis, Bette Midler, Rose Kennedy, Elenor Roosevelt,
James Franco, Gordon Levitt, Pitt, Jolie, Midler,Vreeland,Halston, Warhol, Newton, Mapplethorpe,Azzedine Alaia, Alexander the Great, Davinci,William-Adolphe Bouguereau, Gianni Versace, Hubert de Givenchy, Liev Schreiber, Diane Lane, Jessica Lange, Winehouse, Morrison,  (Warhol muse) Joe Dallesandro, etc................sorry for the length so many interesting people out there past and present, lol..................W

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Marina Romanova, Heidi Fahrenbach, Doutzen Kroes, Katy_T, Laura New Myers