Drupal: Render a picture mapping programmatically

gistfile1.php

<?php

$picture = field_view_field('node', $node, '[IMAGE FIELD MACHINE NAME GOES HERE]', array(
  'label' => 'hidden',
  'type' => 'picture',
  'settings' => array(
    'picture_group' => '[PICTURE MAPPING MACHINE NAME GOES HERE]',
    'fallback_image_style' => '[IMAGE STYLE MACHINE NAME GOES HERE]',
    'image_link' =>'')));
 
print "<a href='/" . drupal_get_path_alias("node/" . $node->nid) . "'>" . render($picture) . "</a>";

?>