This document covers getting values from a term https://www.advancedcustomfields.com/resources/adding-fields-taxonomy-term/
You are doing that incorrectly
$image_id = get_field(‘_thumbnail_id_marque’, ‘term_’ . $term_id);
you can also call this function with the term object instead of "term_{$term_id}"
This document covers using an image field https://www.advancedcustomfields.com/resources/image/
How you use it depends on what you have set as a return value for the image field. But you can always get only the ID value regardless of the return setting by setting the 3rd parameter to false
$image_id = get_field(‘_thumbnail_id_marque’, ‘term_’ . $term_id, false);
