Get tags form WP_Query();

Hi, I’m trying to modify posts based on the tags, but I can’t figure out how to get the tags. This is what i have so far:

<?php
	$main = new WP_Query();
	$main->query('posts_per_page=8');
	while($main->have_posts()) : $main->the_post();
	$count++;
?>
<!-- Do stuff -->
<?php endwhile; ?>

I want to be able to make an if statment like this:
<?php if($tag == new){ echo"<img alt=\"\" src=\"https://example/wp-content/themes/mytheme/images/new.png\" class=\"newest\">";} ?>

Thanks