[HELP!] How to Get Image on Joomla Module for Virtuemart

[BenyaminL]

Hello, I'm newbie on Virtuemart and Joomla. I have a problem, now I goona make a featured item slider on the homepage using Joomla module with fetching from Virtuemart.
Nah, as far I can, I modified the virtuemart mod_virtuemart_product for it. I don't know how to get a image(not thumbnail image, default of product module is show thumbnail). from the Virtuemart product, and I hope there's someone can help me for it, I still reading the virtuemart API but still not found the code that fit for that... Thanks before.

Joomla 3.4.1
VM 3.0
PHP 5.5