Displaying avatar of a user

Hey pass the current user email id in get_avatar() function if user is logged in like this.

<?php 
if ( is_user_logged_in() ) {
    $current_user = wp_get_current_user();
    if ( ($current_user instanceof WP_User) ) {
        echo get_avatar( $current_user->ID, 32 );
    }
}