Highwind - Add your own header image

functions.php

add_action( 'highwind_site_title_link', 'jk_custom_header_image' );
function jk_custom_header_image() {
    ?>
	<img src="path/to/your/image.png" class="avatar" />
	<?php
}

Ive create a child-theme for the highwind template. in the child-theme folder I´ve a folder named "images". in this folder Ive the avatar picture. I change the functions.php as you write above, and I save the functions.php in the child-theme folder. but the picture don`t disapear. My path ist
must the picture have a special size? you can see the workarea here http://work.andrea-fleuchaus-stuttgart.de/

Adding the above code snippet in functions.php adds the image but doesn't remove the existing img tag. Better is to add and avatar plugin and then add the picture.