Try removing the our as @ISA and @EXPORT are special variables and are not related to the package scope..

package QMM::photo::qmm_photo ; 

use strict;
use Exporter;
use DBI;
use lib "/home/loic/server" ;

@ISA = ('Exporter');
@EXPORT = qw(  get_usr_params );
[download]

Hope it Helps
UnderMine