Hi Ash,
Since you are not using an Auctiva template, the only way to align the images the way you have described would be to insert your images directly into the description editor, rather than placing them in the "Select an Image" boxes.
In order to insert your images directly into the description editor, you just need to use the "Insert an Auctiva Hosted Image" button on the bottom-right of the editor toolbar, which has a mountain/sun icon on it.
While images placed in the "Select an Image" boxes are resized to 400 x 300 px and have the "Click to Supersize" option, images placed directly in the description editor will appear full size and will not be supersizable.
Any additional questions or concerns? Please file a support request using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike
