It looks like these buttons are custom for your site. You could try amending the event_list_display.php template at line 155 to remove the text anchor and bring in the image anchor. Replace the image with your own.
//REQUIRED, Anchor of the link, can use text or image
//'anchor' => __("Add to Cart", 'event_espresso'),
'anchor' => '<img src="http://nithyananda.ca/images/add_event_to_cart_btn.png" alt="Add Event to Cart">',
No the Event Registration page wont display the button without a code fix, either as above or you could do_shortcode, but I think the above is probably easiest.
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