The Order Confirmation Email template defines the layout of the email being sent to the user after he/she placed an order. Sometimes you may want to personalize this email being sent out to fit your needs.
Locate the email template in the following directory administrator/components/com_virtuemart/html/templates/order_emails/email_english.html.
Remember the language at the end of the file email_your_language.html , the filename with the default language of your Virtuemart Installation is usually the file that needs to be edited.
In this file you will be able to edit the layout of the email template
The email template is populated with content from the administrator/components/com_virtuemart/classes/ps_checkout.php file using the method function email_receipt(). The email_receipt() function defines placeholders in the template and the values of them are being assigned by using the function str_replace.
To modify the image on the email confirmation, log into the back end of your Joomla! website. And edit the Virtuemart Store. Under the Store section upload the image you need and this will be the image you see in the confirmation email