Multiple image urls and structures

I am preparing to change the main site of my multisite. And I am confused by the multiple urls and file structures of several images from two years ago and before.

For example one image is available on two different image url structures: (on this link, it looks like a post with comment space)

Again it is also found on two thumbnail urls:

Again it is available inside the relevant article:

All these are indexed by Google!

I don't know how this happened. But I am confused on how to fix it.
When I change the subsite domain path, which of these url addresses should I redirect? What should I do with the rest?