// add featured images on post page.
add_action( 'genesis_archive_title_descriptions', 'post_page_featured_image', 9 );
function post_page_featured_image() {
if ( ! is_home() ) {
return;
}
// Display featured image
echo '<div class="featured-image">';
$page_for_posts = get_option( 'page_for_posts' );
echo get_the_post_thumbnail($page_for_posts, 'full');
echo '</div>';
}