I love the first picture! I didn't have time to compose it, it was very quick. A lot of the shots I take are like this, very much run-and-gun. Noticing a very sudden moment and finding a more cinematic perspective on it.
It's rare that I actually compose something with a lot of thought behind it. Most of the time I'm just roaming around and quickly taking things, settings somewhat dialled in based on the lighting already. Mostly it's the shutter speed/ISO, then a few changes to aperture in the moment if I feel there needs to be more depth or a little more darkness/light in the image.