Bigger thumbnails are blurry

Hello,
The site is: http://www.moobuzz.net/ and we want bigger thumbnails in the footer.
WordPress setting is 80×80
The CSS is working great but the images are still 36px and are just being stretched to 48px so they look fuzzy. Could you please tell me what I’m missing?

I followed other forum posts and added this to my child theme’s functions.php and ran regenerate thumbnails.

Here it is functions.php in it’s entirety:

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/
/* make thumbnails bigger */
function my_image_size()
{
global $avia_config;

$avia_config['imgSize']['widget'] 			 	= array('width'=>48,  'height'=>48);
}

add_action('init', 'my_image_size', 1);
?>

wordpress version is up to date 4.6.1, Enfold version is 3.7.1

Thanks!