The difference between Art and Design is that Art has more freedom and has no rules set before it while for a design to be good it must follow certain rules to be successful. 

ART: http://fabskill.com/wp-content/uploads/2016/08/Salt-london1_2486196a-large.jpg

Design: https://c.fastcompany.net/multisite_files/fastcompany/imagecache/1280/poster/2014/10/3036888-poster-p-1-fahrenheit-212s-mark-payne-on-the-trouble-with-design-thinking.png