Decorative images or unnecessary fluff?
A fantastic photo makes any website look great. That's why we see so many website designs that feature a large, impactful image. Their purpose is to establish a tone and emotional appeal. However, web designers often overuse large pictures to the point that they obscure access to information and turn into unnecessary fluff.
This, of course, does not apply to images that convey information. For example pictures of products taken from different angles and their details, company the portfolio, company premises, photos from a travel destination and more. These are desired and essential. Arara: the bater-free bicycle lights uses large pictures to convey the benefits of their product through an effective visual presentation.
Do not fall into the trap of using large images without a clear purpose.