The competition closes this Friday, May 1 and one winner for each character will be chosen on May 8 -- they'll be revealed via the Silverscreen blog and the official SCEE forums. Winners will receive an exclusive in-game item for their Home apartment and a special party will also take place in Home on May 8, in celebration of the launch of the film. All attendees wearing Starfleet uniforms will have the opportunity to win "exclusive Star Trek gifts."
To take part in this competition, simply create an avatar that looks like either Kirk, Uhura or Sulu. Then take three off-screen photos: one close-up headshot, one close-up profile and one full-length body shot. These photos will need to be uploaded to flickr, tagged "Star Trek Avatar Contest" and submitted to the appropriate flickr group with your PSN ID clearly in the description. Good luck!
