Hi IBNRASHID,
Sure! If you would like to place more than 16 images in a single listing you could place the first 16 images in the "Select an Image" boxes, and place any additional images directly into the description editor using the "Insert an Auctiva Hosted Image" button on the bottom-right of the editor toolbar(it has an icon of a mountain and sun on it).
Or, if you would prefer, you could place all of your images directly into the description editor using the "Insert an Auctiva Hosted Image" button on the editor toolbar.
One important thing to know when making this decision is that any images placed directly into the description editor will appear in their orginal size whereas any images placed in the "Select an Image" boxes will be resized to 400 x 300 px and contain the "Click to Supersize" option.
-Mike