Issue Adding a Custom Default Avatar for Comments

So I am running the latest version of the Thesis theme on WordPress 3.5.1.
I wanted to add a custom avatar for comments (for those with no gravatar) so I followed https://diythemes.com/thesis/rtfm/custom-default-comments-avatar/ on my site https://www.pdfelectronics.com

My issue is that it seems from the article that the custom/images folder should have already existed. When I went into Filezilla it was not there so I created the folder/directory.

When I go into my Dashboard on WordPress I can see that I added a new avatar but the picture does not load (yes I resized to 44×44).

Any ideas why?

Here is my custom_functions.php code

if(!function_exists('custom_avatar')){
function custom_avatar($avatar_defaults){
$new_default_icon = get_bloginfo('template_directory') . '/custom/images/resized_avatar.jpg';
$avatar_defaults[$new_default_icon] = 'Resistor (Default)';
return $avatar_defaults;
	}
add_filter('avatar_defaults','custom_avatar');
}

Thanks!
Chris