echo thumb in user array

Hi,

I am doing a user query whereby I get some custom fields from a previously chosen list of users. The code below works just fine. I need to know how to include within this query the thumb pic for each user retrieved. Any ideas?

<?php
$values = get_field( 'execs','options' ); // Custom ACF user field retrieves a list of users
if ( $values ) {
  $execs = array();
  foreach ( $values as $value ) {
    $link = get_author_posts_url( $value['ID'] ); //get the url
    $nicename = $value['display_name'];
    $userdesc = $value['user_description'];
    $position = get_field( 'academic_position', 'user_' . $value['ID'] ); // custom ACF text
    $affiliation = get_field( 'affiliations', 'user_' . $value['ID'] ); // custom ACF text
    $execs[] = sprintf( '<li><a href="%s">%s</a><p>%s</p><p>%s</p><p>%s</p></li>', $link,  $nicename, $userdesc, $position, $affiliation); // listing
  }

  echo '<h4>Executive Committee</h4>';
  echo '<ul>';
  echo implode( $execs );
  echo '</ul>';

} ?>

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