In most niches, images can be an important part of your Authority Site.
They make your pages more visually appealing, so people are more likely to stop and spend some time there. They can also help illustrate a point you're trying to make.
In addition, they can bring you free search engine traffic. Image searches are a fast-growing segment of search engine activity, and naming your image files with relevant keywords (such as backpacking-tent.jpg instead of picture29.jpg) can help your images get found and give you a nice traffic boost.
Images with names that are relevant to your articles can also help your pages rank higher in the search engines.
If you're waiting for the ASC site you've ordered, now is a great time to start gathering and editing your collection of images!