avoiding a footprint

I have a lot of lead gen sites, and I have noticed that if you right click and search image in google, even though these have different phone #'s (since they are different areas/site) google shows a bunch of these. This creates a footprint to where competitors and/or google can potentially link the sites together (even though they do not link to each other)

What is the best way to fix this? Should I make the images no-follow, but won't that heart my SEO since google wants images to be crawable for mobile updates?

Thoughts?

How about using different images? Different design?

If you are saying images in your feeders are on other sites, then you are suffering an image dupe penalty.
Either get orig images or drop them altogether.
Its not even a footprint issue. Simply a dupe content penalty

Just use unique images. Make your own. If one image is used in various sites on the same kind of niche then just avoid using it.

Nothing much can be done easily. but you can do onething everytime create same image with different shade or add a transparent color layer in photoshop in each image. so images have different color pixels