Hi Naina,
Please make this changes to fix the problem.
1. Please keep this css .wmle_container .wmle_item_holder .wpme_image img{height:auto;}
2. Please remove !important from Line number 3 of this file http://www.naina.co/photography/wp-content/plugins/wp-masonry-layout-pro/css/wmlc_client.css?ver=4.2
This should fix your issue.
Thanks.