ISO

ISO is how sensitive the camera's image sensor is. The ISO controls how sensitive the sensor is as light reaches it. The higher your ISO setting the more sensitive it is to light. The ISO scale usually starts at 100, and continues to double from this point. The numbers are 100, 200, 400, 800, 1600... The start and end numbers of this range and how well the camera manages the ISO depends on the type of camera you are using. The higher your ISO number the more noise a photo will have. Most camera's have a 'base ISO' Which will usually (depending on the lighting) make your photos the best they can be without any noise.

As you can see from this comparison that the photo on the lef side was taken with a low ISO `base ISO' therefore the image has less noise. On the right side the photo was taken with a high ISO making the photograph noisy

I think the lighting on this photo works well.

I like how this photo is candid and unprepared.

This photo is too bright as the shutter speed was too slow and the apature size was too big.

I think that the ISO apeture and shutter speed all were at the right settings for this photo as the photo isn't noisy or over/under exposed.