wp_get_attachment_image not to get the post_thumbnaill

You can use post__not_in to exclude the image by ID:

$images_query_args = array(
    'post_type' => 'attachment',
    'post_status' => 'inherit',
    'post_mime_type' => 'image',
    'post_parent' => $post->ID,
    'post__not_in' => array(get_post_thumbnail_id())
);