Image display from custom field

If you use update_post_meta() than also use get_post_meta() (see Codex) and not get_post_custom

$order = get_post_meta( $post->ID, 'order', true );
$image = get_post_meta( $post->ID, 'image', true );

And than check in your HTML source what your image tag looks like. I bet it will look like this:

<img src="https://wordpress.stackexchange.com/questions/75550/coffee_star.jpg" />

What about the path to the image?? Save the complete path of the image, not only the filename.