OK, the following hopefully shows how I , as a viewer would categorise the snapshot, street and photo journal styles. Each style, in my mind, overlaps, and is inclusive, and I could use different, better illustrations, but this is what I've chosen, to illustrate the inclusiveness.
So, here is the snapshot, as it was taken, more or less. Depending on the subject material, then horizons need not be horizontal, in this type of image.
Ray West "Snap Shot"
Yes, the policeman are not placed exactly in the key position of the "rule' of thirds! That creates tension and discomfort. However, by shifting the frame down to place generous foreground space before the group which makes them celebrated by the tension. That does go with the presence of police or a gang or a wild animal or anything else that might threaten or question what you are doing.
I cannot fathom how you might think that this picture needs more interest. Even without the policemen, it gets my attention and pulls me in to explore this? The horizon being straight, that may be even bad. Depends on how the photographer views it. If it is "Snapped" then "Voila", this is it!
I like the photograph as is nd it would get my attention and I may even want to buy it. Who knows, maybe for one of my boys who I know likes such scenes.
The rest of the picture styles? After the first picture which actually is pretty well composed, the others are far less demanding of my attention. When the police are partly cropped and the view is tight, I'm now cheated of what one could see then and there. It is no longer satisfying. We are not seeing a picture within a picture but rather a parsimoniously delivered view.
Asher
BTW, see how the insertion of the text, "Ray West", on the lower right of his picture, adds balance to the figure on the right. Interesting and intuitive placement!