require LWP::UserAgent;
 
my $ua = LWP::UserAgent->new;
$ua->timeout(10);
$ua->env_proxy;

my $response = $ua->get('url_to_some_picture.jpg');
open(outfile, '>file_path_name');

if ($response->is_success) {
    print outfile $response->content;
}
else {
    die $response->status_line;
}