When you click a category in woocommerce , then all products listed under that category . But if the category has some sub category then is not displayed . So Woocommerce Subcategory Thumb plugin will display the sub categories thumb as along with product . See the screenshot .
NB : wootheme compatible only .
If you have suggestions or bugfixes for the plugin, contact me in my official site (http://myplugin.tophostbd.com/)
If you want to translate the plugin into your language, contact me