Output Gravity Forms Image Uploads as an image in the cart.

cart-item-data.php

<?php
/**
 * Cart item data (when outputting non-flat)
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/cart/cart-item-data.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see           https://docs.woocommerce.com/document/template-structure/
 * @author        WooThemes
 * @package       WooCommerce/Templates
 * @version       2.4.0
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
?>
<dl class="variation">
	<?php foreach ( $item_data as $data ) : ?>

        <?php //TODO:  Change the next line to match your Image Field Name ?>
		<?php if ( $data['key'] == 'Image' ) : ?>

			<?php
			$src = $data['value'];
			$dom = new DOMDocument;
			$dom->loadHTML( $src );
			foreach ( $dom->getElementsByTagName( 'a' ) as $node ) {
				$src = '<img src="' . $node->getAttribute( "href" ) . '" />';
			}
			?>

            <dt class="<?php echo sanitize_html_class( 'variation-' . $data['key'] ); ?>"><?php echo wp_kses_post( $data['key'] ); ?>: </dt>
            <dd class="<?php echo sanitize_html_class( 'variation-' . $data['key'] ); ?>"><?php echo $src; ?></dd>
		<?php else: ?>
            <dt class="<?php echo sanitize_html_class( 'variation-' . $data['key'] ); ?>"><?php echo wp_kses_post( $data['key'] ); ?> :</dt>
            <dd class="<?php echo sanitize_html_class( 'variation-' . $data['key'] ); ?>"><?php echo wp_kses_post( wpautop( $data['display'] ) ); ?></dd>
		<?php endif; ?>
	<?php endforeach; ?>
</dl>