ACF Fields and Taxonomy Image size?

I have an ACF image field associated with taxonomies , it pulls in a custom image to be used on the archive page. It list's all Taxonomies with the image , short description and link to each taxonomy archive.

I have it working with the code i found below , no loop , just pulling in the fields.

Question is : How can i include a custom image or call a thumbnail ? i've tried lost of variations to show a thumbnail , but somehow nothing shows up ?

With the code below , the image field is set to return the 'URL' and it works , but i would like to control the image size. Don't know how to enter that ?

image field named - tax-image

<?php


    $libargs=array(  
        'hide_empty'    => 0,  
        'parent'        => 0,  
        'taxonomy'      => 'compressor-range');  

        $libcats=get_categories($libargs);  

        foreach($libcats as $lc){ 
            $termlink = get_term_link( $lc->slug, 'compressor-range' ); 

    ?>

     <div class="row tax-list">

        <div class="tax-img">
           <a href="<?php echo $termlink; ?>"><img src="<?php the_field('tax_image' , 'compressor-range_'.$lc->term_id); ?>" alt="view range"/></a>
        </div>

        <div class="tax-description">
           <h2><a  href="<?php echo $termlink; ?>"><?php echo $lc->name; ?> Range</a></h2>
           <?php the_field('tax_description', 'compressor-range_'.$lc->term_id); ?><a  href="<?php echo $termlink; ?>"> ....View the range</a>
        </div>

    </div>

    <?php }