Insert post from frontend form

Question

I am trying to insert post from frontend form i have different fields and i also want to upload an image. But the problem is that all othere data store except image so here is my code

if( 'POST'  == $_SERVER['REQUEST_METHOD' ] && !empty( $_POST['action' ] ) &&  $_POST['action' ] == "new_post") {
 require_once(ABSPATH . 'wp-admin/includes/image.php');
    // Do some minor form validation to make sure there is content
    if (isset ($_POST['post_title' ])) {
        $title =  $_POST['post_title' ];
    } else {
        echo 'Please enter the wine name' ;
    }
    if ($_POST['description' ] != '' ) {
        $description = $_POST['description' ];
    } else {
        echo 'Please enter some notes' ;
    }

    $tags = $_POST['post_tags' ];
    $post_link = $_POST['post_link' ];

    // ADD THE FORM INPUT TO $new_post ARRAY
    $new_post = array(
    'post_title'    =>  $title,
    'post_content'  =>  $description,
    'post_category'     =>  array($_POST['cat' ]),  // Usable for custom taxonomies too
    'tags_input'    =>  array($tags),
    'post_status'   =>  'draft' ,           // Choose: publish, preview, future, draft, etc.
    'post_type'     =>  'post' ,  //'post',page' or use a custom post type if you want to
    );

    //SAVE THE POST
    $pid = wp_insert_post($new_post);

             //KEEPS OUR COMMA SEPARATED TAGS AS INDIVIDUAL
    wp_set_post_tags($pid, $_POST['post_tags' ]);

    //REDIRECT TO THE NEW POST ON SAVE
    //$link = get_permalink( $pid );
    //wp_redirect( $link );

    //ADD OUR CUSTOM FIELDS 
    add_post_meta($pid, 'post_link' , $post_link, true); 

    //INSERT OUR MEDIA ATTACHMENTS
    if ($_FILES) {
        foreach ($_FILES as $file => $array) {
        $newupload = wp_insert_attachment($file,$pid);
        // $newupload returns the attachment id of the file that
        // was just uploaded. Do whatever you want with that now.
        }

    } // END THE IF STATEMENT FOR FILES

} // END THE IF STATEMENT THAT STARTED THE WHOLE FORM

//POST THE POST YO
do_action('wp_insert_post' , 'wp_insert_post' );

Now please guide me and correct my code where i missing some thing. I have to upload image. Just modifiy this code. Thanks