When looking at a picture of a living person you see the life in it, in them. You may even smile back at them as if they could see you. But when you look into a picture of one no longer living it looks flat and makes you feel flat. And if you attempt a smile it is with the sad recognition that they will not be able to smile back. There is no spark of life any more in their picture~only the spark of their life you still carry with you in your soul.