Thanks for that. At first glance, it looks like that is a good place to be, regarding images. I will still investigate when I find time.

Probably the main thing you could look at is what pixel density you want in your images.

For example, there's a 1 megabyte image of a tanker trailer that is displayed at about 1.5 x 3 inches, you could get rid of 3/4 of those pixels (going from ~400 ppi to ~200 ppi) and not really change the quality of the image for a casual reader.