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<?php

function new_post_thumbnail_meta_box() {
    global $post;
    echo 'Add image that is perfect scaled and have less than 145px x 145px';
    $thumbnail_id = get_post_meta($post->ID, '_thumbnail_id', true);
    echo _wp_post_thumbnail_html($thumbnail_id);
}

function render_new_post_thumbnail_meta_box() {
    global $post_type;
    if ($post_type == 'teamuser' || $post_type == 'supporter') {
        remove_meta_box('postimagediv', 'post', 'side');

        add_meta_box('postimagediv', __('Image'), 'new_post_thumbnail_meta_box', $post_type, 'side', 'low');
    }
}

add_action('do_meta_boxes', 'render_new_post_thumbnail_meta_box');
?>