Hi,
First of all, Joomla2.5 is not the ideal way of running VM3, you should update your Joomla to J3.x. CleanMart is tested with J3.x only. The Error message in your screenshot seems like a Joomla error messages, i don't have the patches for them. You should hide them by disabling the "Error Reporting" via Joomla Global Configuration.
To fix the IMAGE problem; Navigate to
Virtuemart Backend >> Configuration >> Templates
and make sure to enable this option: "Using the VirtueMart CSS"
Also try this; open this CSS file:
/templates/YOUR_TEMPLATE/html/com_virtuemart/assets/css/flexible.css
and include this CSS rule:
regards