Display Uploaded Image

Hello, I’m working on a directory template and am interested in replacing the cover photo with a user uploaded image. When I add this to the template, I get the image file name. Any advice would be greatly appreciated!

<?php echo um_user(‘main_portfolio_image’, $cover_size); ?>

site: http://roughandreadymedia.com/artalliance/members/?last_name=miller&first_name=&um_search=1