Prototyping difficulties while trying to change the colors of images

I am trying to change the color of my product, when color picker is being clicked. I have created “Local Variables”, also I have created Instance of the images, but I can’t seem to change the images up above. 
I am new in figma prototyping, please help me out!
 

https://www.figma.com/design/uGbDTi3HygHqtXQZqkoyfh/SONARA?node-id=377-569&t=hO7AeZ4gymJeocSK-1