In case you have got only 1 picture of a girl of whom you would like an ID, then - before posting your request - first use flw. options for image search:
Google Image Search:
http://www.google.com/imghp
click the 'camera' -icon and switch off the adult-filter (SafeSearch) if necessary
or
TinEye:
http://www.tineye.com
You will be amazed about the rate of success !
Moreover, that way you will not waste your one and only daily request....