Add an thumbail generated by timthumb in customised RSS feed

Hi,

First, here is my WP configuration:
– Theme used: Arthemia Premium
– Extension: timthumb.php
– Name of Owner: OVH
– Website: https://www.mood-for.fr

My problem.
I try to set up a customised RSS feed with the title of each article, the first 450 characters and a thumbail. The ultimate goal is to implement this feed in MailShimp to send a “notification” e-mail to subscribers with the latest blog posts.

I just integrated the image to illustrate each section. The idea is to use the plugin as timthumb on our homepage.

To implement this RSS feed, I created a WordPress page with a specific template. Here is the template code:
Code:

1.
      <?php
   2.
      /*
   3.
      Template Name: Custom Feed newsletter daily
   4.
      */
   5.

   6.

   7.
      $numposts = 10; // number of posts in feed
   8.
      $posts = query_posts('showposts='.$numposts.'&cat=-1'); // replace the number 1 with the ID of your tumblelog category
   9.
      $more = 1;
  10.

  11.
      header("Content-Type: application/rss+xml; charset=UTF-8");
  12.
      echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>';
  13.
      ?>
  14.

  15.
      <rss version="2.0"
  16.
        xmlns:content="https://purl.org/rss/1.0/modules/content/"
  17.
        xmlns:wfw="https://wellformedweb.org/CommentAPI/"
  18.
        xmlns:dc="https://purl.org/dc/elements/1.1/"
  19.
        xmlns:atom="https://www.w3.org/2005/Atom"
  20.
        xmlns:sy="https://purl.org/rss/1.0/modules/syndication/"
  21.
        xmlns:slash="https://purl.org/rss/1.0/modules/slash/"
  22.
        <?php do_action('rss2_ns'); ?>
  23.
      >
  24.
      <channel>
  25.
        <title><?php bloginfo_rss('name'); wp_title_rss(); ?> - Article Feed</title>
  26.
        <atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
  27.
        <link><?php bloginfo_rss('url') ?></link>
  28.
        <description><?php bloginfo_rss("description") ?></description>
  29.
        <lastBuildDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_lastpostmodified('GMT'), false); ?></lastBuildDate>
  30.
        <?php the_generator( 'rss2' ); ?>
  31.
        <language><?php echo get_option('rss_language'); ?></language>
  32.
        <sy:updatePeriod><?php echo apply_filters( 'rss_update_period', 'hourly' ); ?></sy:updatePeriod>
  33.
        <sy:updateFrequency><?php echo apply_filters( 'rss_update_frequency', '1' ); ?></sy:updateFrequency>
  34.
        <?php do_action('rss2_head'); ?>
  35.
        <?php while( have_posts()) : the_post(); ?>
  36.

  37.
        <item>
  38.
          <title><?php the_title_rss(); ?></title>
  39.
          <link><?php the_permalink_rss(); ?></link>
  40.
          <comments><?php comments_link(); ?></comments>
  41.
          <pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_post_time('Y-m-d H:i:s', true), false); ?></pubDate>
  42.
          <dc:creator><?php the_author(); ?></dc:creator>
  43.
      <?php the_category_rss(); ?>
  44.
          <guid isPermaLink="false"><?php the_guid(); ?></guid>
  45.
      <?php if (get_option('rss_use_excerpt')) : ?>
  46.

  47.
          <description><![CDATA[<a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><img src="https://www.mood-for.fr/wp-content/themes/arthemia-premium/scripts/timthumb.php?src=<?php echo get_option('home'); ?>/<?php $values=get_post_custom_values("Image"); echo $values[0]; ?>&w=200&h=225&zc=1&q=70" alt="<?php the_title(); ?>" class="left" width="200px" height="225px"  /></a><?php the_excerpt_rss(450, $encode_html) ?>]]></description>
  48.

  49.
              <?php else : ?>
  50.

  51.
          <description><![CDATA[<?php the_excerpt_rss(25, $encode_html) ?>]]></description>
  52.
        <?php if ( strlen( $post->post_content ) > 0 ) : ?>
  53.

  54.
          <content:encoded><![CDATA[<?php the_content(150) ?>]]></content:encoded>
  55.
        <?php else : ?>
  56.

  57.
          <content:encoded><![CDATA[<?php the_excerpt_rss(25, $encode_html) ?>]]></content:encoded>
  58.

  59.
        <?php endif; ?>
  60.
      <?php endif; ?>
  61.
          <slash:comments><?php echo get_comments_number(); ?></slash:comments>
  62.
      <?php rss_enclosure(); ?>
  63.
      <?php do_action('rss2_item'); ?>
  64.

  65.
        </item>
  66.
        <?php endwhile; ?>
  67.

  68.
      </channel>
  69.
      </rss>

Now, the flow displays a picture for each article but can not find the image file: https://www.mood-for.fr/rss-newsletter-daily/. I’m not an experienced developer, so I’m lookig for help me configure the page template to display the correct thumbail for each post, using the plugin timthumb?

Thank you in advance