If there is not an image in the file I save it. I store my zips with 3 parts - the zip, the image, the info. Plus I also keep spreadsheets which sadly are currently out of date.
I store them in files by Site with subfolders of type when I can. Arches, paths, fences, etc Mixed pack folders also have sub folders.
The info is a copy from the site along with the file size and the zip name and I embed a copy of the image in it. This I use at DD for the posts and also to provide info for reloading when a file has gone missing or as in the past something has happened to the site.
I use the images a lot. By having them loose in each folder I can look through them when looking for things I want for a particular zoo.