WordNet (r) 3.0 (2006):

mug shot
    n 1: a photograph of someone's face (especially one made for
         police records) [syn: mug shot, mugshot]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "mug shot":
   Telephoto, Wirephoto, aerial photograph,
   black-and-white photograph, candid photograph, cheesecake,
   chronophotograph, color photograph, color print, diapositive,
   heliochrome, heliograph, montage, mug, photo, photobiography,
   photochronograph, photograph, photomap, photomicrograph,
   photomontage, photomural, picture, pinup, portrait, shot, slide,
   snap, snapshot, still, still photograph, telephotograph,
   transparency