[Theme Horse Support Team]

Hi Gerg,

Just view this demo. https://www.themehorse.com/preview/clean-retina-pro/

To add images only instead of text then it needs code customization. We are sorry for this. This feature is not available in our theme.

You may just add the widgets text and use image in footer sidebar. View this screenshot.
http://www.awesomescreenshot.com/image/71833/2e70492c61fd602851dd6f30649e5bb6

Thank you!