inserting images into page template page

I have developed a page.php template which calls the header (which includes the beginning of a div “mainContent”) and the footer as below.
<?php
/*
Template Name: page
*/
?>
<?php get_header(); ?>
this is for the main content
</div>
<?php get_footer(); ?>
I have put images into the media library and then included them on a new page based on the page.php template. but the images don’t appear on the page. What am I doing wrong?