Myself.
People who can impress me, expand my horizont, excite me, turn me on or inspire me. (Inspiration is good but I take care of it, for it's a small step from inspiration to imitation.) Someone who can teach me a better posing! *g*
Living persons: Els Pynoo, Amanda Palmer, Beth Gibbons, Patti Smith, Lisa Randall, Alzbeth, Mylene Farmer, Greta Csatlos, Dita von Teese, Valeria Sinistrari, Angelina Jolie, Uma Thurman, Bettie Page, Eva Aeppli, Rock Bitch, Peaches, Natalia, Lemmy, Blixa Bargeld, Trent Reznor, Marilyn Manson, Peter Greenaway, Simon Marsden, Helmut Newton, Peter W. Czernich, Luis Royo, Richard Dawkins, Richard Rorty, David Chalmers, Bon Scott, David Lynch, Iggy Pop, Daniel Dennett, Peter Sloterdijk ...
and maybe you.
Dead persons: Friedrich Nietzsche, Oscar Wilde, Salvador Dali, H.P. Lovecraft, J.P. Sartre, Albert Camus, Timothy Leary, Jane Mansfield, Bertrand Russell, Roman Ingarden, Hannah Arendt, Frederico Fellini, Richard Wagner, Jim Morrison, Albert Einstein, Socrate, Aristotle, Epicurus, Dante Alighieri, Giuseppe Arcimboldo, Sergei Rakhmaninow, Igor Stravinsky, Oriana Fallaci, Man Ray, Kurt Cobain, Max Stirner, M. de Sade, Michel Foucault, Robert Nozick, Franz Kafka...
And always: Life, the universe and all the rest.