When Is It Necessary to GEOTAG an Image?

[AWCthreads]

In local SEO practices, is it best to geotag all images or only specific ones?

For example, if we have images of our retail store on our G+ page (or on our About Us page) it seems like common sense to geotag those images.

However, if you're a local photographer do you want to geotag all of your images or only images shot in locations where you'd like to rank?