Here is some test code I wrote based on what you posted. Maybe it will describe better what I was trying to explain in paragraph form... If you try running this I have two modes $test_do_insert = 1 or $test_do_insert = 0 so you can test multiple cases, etc. If this works for you, all you need to do is put your mysql query and insert lines into the code where applicable. Does this solve your problem?

#!/usr/bin/perl

use strict;
use warnings;

my @pics;

my $test_do_insert = 1; #change value to 0 to change variables to test
+ a case where it should not insert

my $image_name_1 = "";
$image_name_1 = "test_image1.jpg" if (!$test_do_insert);
$pics[0] = 'test1.jpg';

my $image_name_2 = "";
#$image_name_2 = "test_image2.jpg" if (!$test_do_insert);
$pics[1] = "test2.jpg";

my $image_name_3 = "";
#$image_name_3 = "test_image3.jpg" if (!$test_do_insert);
$pics[2] = "test3.jpg";

my $image_name_4 = "";
#$image_name_4 = "test_image4.jpg" if (!$test_do_insert);
$pics[3] = "test4.jpg";

if (@pics) {
    my $flag_pic = 0;

      # while (my $row = $sth->fetchrow_hashref()) {
                $flag_pic += &check_empty($image_name_1, $pics[0]);
                print $flag_pic."\n";
                $flag_pic += &check_empty($image_name_2, $pics[1]);
                print $flag_pic."\n";
                $flag_pic += &check_empty($image_name_3, $pics[2]);
                print $flag_pic."\n";
                $flag_pic += &check_empty($image_name_4, $pics[3]);
                print $flag_pic."\n";
      # }
       print "<br>751**$flag_pic**<br>";
    # End check
    if ( $flag_pic == 0 ) {
                print "doing insert";
     }
     else {
                print "not doing insert";
     }
  }

sub check_empty() {
        my $img = shift;
        my $pic = shift;

        if ( $img ne ""  && $pic ne "" ) {
                return 1;
        }
        else {
                return 0;
        }
}
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