Include thumbnail on other page

This is what I’m trying to do:

A page has a thumbnail image

On other pages, I want to include, shortcode-style, a link to other pages. I want this to be the thumbnail of the page I’m linking to.

As a bonus point, I’d really love the format to be like..

[pagelink id=pagenickname] but if it needs to be [pagelink id=334] that’s okay.

this is what I have right now.

<?php
	function do_pagelink($atts) {

    extract(shortcode_atts(array(
        'id' => 1,
        'text' => ""  // default value if none supplied
    ), $atts));

    if ($text) {
        $url = get_permalink($id);
        return "<a href='$url'>$text</a>";
    } else {
       return get_permalink($id);

    }
}
add_pagelink ('sponsor', 'do_pagelink');