dhananjaysingh

Using this plugin you can associate one image with each of your category created in wordpress. and you can call that image by using provided function in any template file 
 tejus_dj_getcatimg($catid) 
call this function in any template file it will return url of that image. 
where $catid is category id of that category. 
my facebook profile : https://www.facebook.com/dhananjay.singh2 
my company website: http://tejuscreative.com/

category image

Using this plugin you can add images to categories

Binternet

This plugin is an extended version of <a href="https://wordpress.org/plugins/categories-images/" rel="ugc">Categories Images</a>.
The Categories Multiple Images Plugin allow you to add unlimited amount of image to a category or any other taxonomy.
You can use:

to get the direct image url and put it in any tag in your template.
Also from settings menu you can exclude any taxonomies from the plugin to avoid conflicting with another plugins like WooCommerce!
More documentation 
https://github.com/Binternet/WordPress-Plugin-Categories-Multiple-Images

Categories Multiple Images

The Categories Multiple Images Plugin allow you to add image unlimited images to category or any other taxonomy.

category image vs Categories Multiple Images