Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--dashboard{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--orders{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--downloads{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--edit-address{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--edit-account{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--wishlist{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}
.woocommerce-MyAccount-navigation li.woocommerce-MyAccount-navigation-link--customer-logout{
	background-image:url(https://woodmartcdn-cec2.kxcdn.com/wp-content/uploads/2016/07/blog-11-75x65.jpg);
	background-size:contain;
	background-position:top right;
  background-repeat:no-repeat;
}

As soon as you upload icons into Media library, replace image URLs in each item.

Best Regards