ISO is the number that shows how sensitive the camera sensor is to light.

my pictures using ISO

picking my favourite pictures:

I started by flagging my favourite images and giving them rankings from 1 to 5

my 5 star pictures:

then I colour in the images:

And finally I used the compare tool to pick the image I would like to use:

As much as I like both of them I decided to choose the one on the right because I like how the light is more on the far part of the image and the closer part is darker and I think it contrasts really nicely.

Editing:

I decides to make the picture black and white because it sets an ambiance. I also removed most of the whites because I wanted my picture to be dark.