Get avatar from user_id

1 - I have two members witch settings are set to subscribers.

2 - I have made a page in wordpress with the code:

<img src="get_avatar" alt="Logano" onerror="this.src='./files/defaultHead.jpg'"><a>Get_name</a>

3. Now I want get the members avatar to that img and also the name to this page.

How do I do this, what do I have to do?

I've tried to find a answer but I only see this: <?php echo get_avatar( $id1, $size, $default, $alt ); ?>