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// PHP in functions.php

function products_scripts() {
    if(is_singular('product')) {
        wp_enqueue_style( 'prettyPhoto_cs', '/wp-content/plugins/js_composer/assets/lib/prettyphoto/css/prettyPhoto.min.css' );
        wp_enqueue_script( 'prettyPhoto_js', '/wp-content/plugins/js_composer/assets/lib/prettyphoto/js/jquery.prettyPhoto.min.js', array('jquery'), '', true);
    }
}

add_action( 'wp_enqueue_scripts', 'products_scripts' );

// PHP on page/post template

<?php foreach( $images as $image ): ?>
    <a href="<?php echo $image['url']; ?>" class="prettyphoto" rel="prettyPhoto[galleryName]">
        <img src="<?php echo $image['sizes']['thumbnail']; ?>" alt="<?php echo $image['alt']; ?>" />
    </a>
<?php endforeach; ?>

// JavaScript on page/post template

<script type="text/javascript" charset="utf-8">
  jQuery(document).ready(function(){
    jQuery("a[rel^='prettyPhoto']").prettyPhoto();
  });
</script>