image is looking different on computer than on iphone

Hi,

I have support access on for parisprivatephototours.com. The client sent the following message to me:

http://www.parisprivatephototours.com/photos/ on the first page from the iphone the Eiffel Tower picture looks good (crisp and accurate)

Through my computer it's still looks horrible, very hazy and blurry…..Any way we can change that?