$sth->execute($id);
my $row = $sth->fetch();
$sth->finish();
if ($row) {
   ...
} else {
   # No more images
   ...
}

##</code><code>##

my $row = selectrow_arrayref($stmt_or_sth, undef, $id);
if ($row) {
   ...
} else {
   # No more images
   ...
}