Depending on the type of camera and night specification, I would say the snapshot examples are about normal for night vision on an 'average' domestic system. Some cameras have demisting, others do not or not so good. The same with the luz factor and how many 'bulb' around the camera lense.
If you have an infra-red security type lamp installed, when activated you should get a far better picture and camera result of the area that's being illuminated, perhaps similar to a normal 'clear' day.
What's the picture results like, during the day?.
If you provide details of the camera or kit, then perhaps alan14 might be able to provide some answers?.