ahoyit i was ofcourse able to override via CSS, but still wanted to set via MODULE settings.
You may change this :
.itemid-118 .jamasthead {background-image: url(/new/images/backgrounds/zn-cpa_contact2.jpg);}
to
.itemid-118 .jamasthead {background-image: url(/new/images/backgrounds/zn-cpa_contact2.jpg) !important;}
so as to ensure that the respective bg-image supersedes the default bg-image and reflects thereon.
Almost, Similar issue had been replicated in other forum thread due to reason outlined here
although the solution as specified by the member has been through module settings however, the same is already being used here for reflecting respective bg-images