Thanks @ihor i really appreciate your help.
I really want to add pictures to my category icons. You said I can do this only by overriding the category image template part and also adding the Image field to the back-end category form, then using the uploaded image URL.
To be honest I’m confused and the tutorials didn’t help. Can you please break it down for me to understand in a more simpler way so I can do it myself. Like step by step process. How do I add the image field to the back end category form and how do I upload different images for different categories. 