WordPress Landing Template - Using Child Page Featured Image

<?php
/*
Template Name: Projects
*/
get_header(); ?>

<div id="primary">

<div id="content" role="main">
    <header class="entry-header">
    <h1 class="entry-title"><?php the_title(); ?></h1>
    </header>

        <div class="entry-content">

        <?php the_content(); ?>

        <?php
        $args = array(
        'post_parent' => $post->ID,
        'post_type' => 'page',
        'post_status' => 'publish',
        'numberposts' => -1
        );

        $postslist = get_posts($args);
        foreach ($postslist as $post) :
        setup_postdata($post);
        ?>

        <div class="project">

        <a href="<?php the_permalink(); ?>"><?php if( has_post_thumbnail() ) the_post_thumbnail('Project'); ?></a>

        <div class="project-meta">
            <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
            <p class="time"><?php the_time('F, Y') ?></p>
        </div><!-- project-meta -->

        <div class="project-summary">
            <?php the_excerpt(); ?>
        </div><!-- project-summary -->

        </div><!-- project -->

        <?php endforeach; ?>

        </div><!-- entry-content -->

    </div><!-- #content -->

    </div><!-- #primary -->

<?php get_footer(); ?>