Add member's name and avatar to the masthead on the membership account page using the Memberlite theme.

my_membership_account_memberlite_after_masthead_inner.php

<?php
/**
 * Add member's name and avatar to the masthead on the membership account page using the Memberlite theme.
*/
function my_membership_account_memberlite_after_masthead_inner( ) {
	global $pmpro_pages, $current_user;
	if ( ! empty( $pmpro_pages ) && is_page( $pmpro_pages['account'] ) ) {
		echo '<div class="text-center">' . get_avatar( $current_user->ID, 128 ) . '</div>';
		echo '<h1 class="text-center">Welcome, ' . $current_user->display_name . '</h1>';
	}
}
add_filter( 'memberlite_after_masthead_inner', 'my_membership_account_memberlite_after_masthead_inner' );