There are some things God made not to be described, but to be felt. To say whether some picture has soul or not is a rather difficult task. Perhaps we could evaluate that (as said once Andreas Feininger) by one of the symptoms on the beholder: the stopping power. If the image is able to freeze the beholder for at least 30 seconds with pleasure, we could conclude there are soul/emotion/quality on it. As said Dr Bob : "We don't know what electricity is" but we know its symptoms.