> but I would want all jpegs on the home index page, and in
> particular any images separately, for instance

There are quite a number of threads here about this.  You 
won't be able to mirror only images, because HTTrack must 
follow links on the pages (HTML) to find the images.

Best way is to crawl a site with general rules (stricter 
rules may be better, but very dependant on the actual site) 
but using a Build Structure (see Options > Build tab) like:

Html in web/, images/other in web/xxx, where xxx is the file 
extension

This way the images are separated into a folder of their 
own.