declare
  image_path varchar2(80) := 'C:\R_ORACLE\PHOTOS\';
  photo_name varchar2(80);
begin
  :system.message_level := '25';
  photo_name := image_path||:empno||'.jpg';
  read_image_file(photo_name,'jpg','snap');
  
  if not form_success then
     /*i want to display this image
       ('C:\R_ORACLE\PHOTOS\9999.jpg');*/
     --message('This employee does not have a photo');
     --message('This employee does not have a photo');
  end if;

  :system.message_level := '0';
end;