<?php
apply_filters( 'fv_user_mail_body', 'fv_filter_user_mail_body', 10, 2 );

function fv_filter_user_mail_body($body, $photo) {
  $body = str_replace('{contestant_description}', $photo->description, $body);
  $body = str_replace('{contestant_full_description}', $photo->full_description, $body);
  return $body;
}