You mean that instead of the drop down options you display as images?
I think you need to clone the Smart Search Filter Web Part and add your custom image filter mode:
![https://content.screencast.com/users/DavidTK/folders/Jing/media/fbd25ceb-ad6d-4feb-bf36-81e5563a76b7/2019-10-15_1203.png](https://content.screencast.com/users/DavidTK/folders/Jing/media/fbd25ceb-ad6d-4feb-bf36-81e5563a76b7/2019-10-15_1203.png)
Which will probably be same checkbox listing but in code you add a css class that will be picked up by your styling.