The easiest way to place full-size versions of your images within your listing is to enter your images directly into the description editor on the listing creation page instead of using the Auctiva Image Selection section.
On the description editor toolbar, locate and click the button with a mountain/sun icon named "Insert An Auctiva Hosted Image." When you add an image to the description using this button, it will appear in its original size (up to 1280 x 1024 px) and will not have a "Click to view supersized image" link.
Alternatively, you could create a custom template to use with your listings in which you use the [DESCRIPTION] tag and original image tags (like [IMAGES1_ORG]) to indicate where your description and images should be placed within the template, instead of the [DESCRIPTION_AND_IMAGES] tag that is used in all our library templates.
If you would like to use these original image tags in a custom template, select "Original Images" from the "Choose Image Type" drop-down menu in the "Custom Template Tags" interface on the template creator and then click the links for Image 1, Image 2, Image 3, etc.