I use Joomla 3.3 and VM 3.0.2
Moving the mouse in category view over the product main image shows the product name:
http://www.oudvorden.nl/index.php/component/virtuemart/boerderij/de-leuke2015-01-26-08-32-101745170613?Itemid=0.
Moving the mouse in product details over the additonal images, I see the image names:
http://www.oudvorden.nl/index.php/component/virtuemart/boerderij/de-leuke2015-01-26-08-32-101745170613/de-leuke-1-detail?Itemid=0
How can I get a uniform approach, i.e. also the main image showing image name at mouseover.