How to add font end image replace for avatar

OK i managed to display it on my-account by putting this code into the MB View

{% for item in user.custom_avatar %}
	<img src="{{ item.large.url }}" width="{{ item.large.width }}" height="{{ item.large.height }}" alt="{{ item.large.alt }}">
{% endfor %}

Now i want to replace the gravar with this custom avatar uploaded
Now i use the following snippet. Is this correct ?

Is the value returned from image upload an array instead of single image?

/** metabox custom avatar to replace WordPress gravatar */

add_filter( 'get_avatar_url', 'mbua_get_avatar_url', 10, 3 );

function mbua_get_avatar_url( $url, $id_or_email, $args ) {
    if ( is_numeric( $id_or_email ) ) {
        $user_id = $id_or_email;
    } elseif ( is_string( $id_or_email ) && ( $user = get_user_by( 'email', $id_or_email ) ) ) {
        $user_id = $user->ID;
    } elseif ( is_object( $id_or_email ) && ! empty( $id_or_email->user_id ) ) {
        $user_id = (int) $id_or_email->user_id;
    }

    if ( empty( $user_id ) ) {
        return $url;
    }

    $array_avatar = rwmb_meta( 'custom_avatar', [ 'object_type' => 'user', array( 'limit' => 1 ) ], $user_id );

    if ( ! $array_avatar ) {
        return $url;
    }

	$custom_avatar = reset( $array_avatar );
    $url = $custom_avatar['full_url'];

    return $url;
}

Hello Long,

i am using view to display the custom avatar
[mbv name="user-avatar"]

the template is

{% for item in user.custom_avatar %}
	<img src="{{ item.large.url }}" width="{{ item.large.width }}" height="{{ item.large.height }}" alt="{{ item.large.alt }}" />
{% endfor %}

Users uploads all sort of image dimensions.
If possible, could you please what should i use to format the display of the custom avatar to 512px x 512px ?

Thank you
Joie