Seen in this Gist: https://gist.github.com/Bradley-D/7287723

// Get The Page ID You Need
 get_option( 'woocommerce_shop_page_id' );
 get_option( 'woocommerce_cart_page_id' );
 get_option( 'woocommerce_checkout_page_id' );
 get_option( 'woocommerce_pay_page_id' );
 get_option( 'woocommerce_thanks_page_id' );
 get_option( 'woocommerce_myaccount_page_id' );
 get_option( 'woocommerce_edit_address_page_id' );
 get_option( 'woocommerce_view_order_page_id' );
 get_option( 'woocommerce_terms_page_id' );

// An Example
 function get_shop_featured_image() {
 if( is_shop() ) {
 $shop = get_option( 'woocommerce_shop_page_id' );
 if( has_post_thumbnail( $shop ) ) {
 echo get_the_post_thumbnail( $shop );
 }
 }
 }

// In You Templage File Place The Following
 // Line To Call The WooCommerce Shop Featured Image
 // Now You're Cooking With Gas - BOOM!!