Like the quote goes “A picture is worth a thousand words”, People love beautiful images and tend to enjoy natural photos rather than fake made up photo shoots. Images convey the message of your brand when people land on your website first time. This is probably one of the reasons why many web designers use large background image.
https://www.blindbarber.com – Beautiful Image Header
http://www.veevlife.com – Beautiful big image
http://humblebee.se – A header image that conveys the creativity.