Search Engine Optimisation
If you wish search engines such as Google to be able to find and index your images then there are a couple of things that you can do.
A very worthwhile optimisation to make is to add one or two important keywords to the filenames of your images. For example, cat_stuck_chimney.jpg is much better than _IMG_0358.jpg.
Since you can control the filename via the Publishing Manager you many be able to create a filenaming template that meets your needs. For example, you may choose to put an SEO friendly version of the filename into the "Copy Name" field and export using that.
The other important optimisation is to ensure that the 'alt' text is specified on a per image basis. The text is included alongside the image in the HTML code, and is typically used by browsers to display a description of the image while waiting for it to load. It's also used by search engines to index the contents of the images.
All the plugins in the series allow you to add 'alt' text to your images.