WooCommerce product category custom image

I've been digging and digging, but I'm not finding the answers I need on this. I currently am using WordPress - Woocommerce, a purchased theme called Shopifiq.

I want to display a different banner on each product category page. The only thing I can think of is adding something like:

if ( is_product_category( '#' ) ) {
    echo do_something(); //display category thumbnail 
}

in maybe the functions.php file but I'm not too familiar with PHP and I'm struggling. Any help would be super appreciated!