Oh so you Authors is a repeater and in that you have a multiple select post object that is People? If so try this:
$images_query = new WP_Query([
'posts_per_page' => -1,
'post_type' => 'images',
'meta_query' => [
[
'key' => 'authors_%_people',
'compare' => 'LIKE'
'value' => '"'.85.'"',
],
],
]);