@Brianna95 Of course there can be legitimate resons why a host doesn't send a response to a message right away- they may at work, it may be a quite different time zone and they're asleep, where I live the internet can be dicey at times. But a responsible host will try to get back to you ASAP. If I were a guest and didn't get a response to a message within 12 hours, I'd move on to another listing.
BTW, there are lots of guests who use stock photos, photos of their cat, a cartoon character, a plate of spaghetti, or as in your case, a landscape. Hosts would like to be able to see a real photo of the person that will be staying, just as guests would like to see a real photo of the host.