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Here we have 3 Photo's of underexposed photo's during an event at school.
In the 1st photo, we see that the lighting of the photo is dark. That is due to the reason of the ISO being low being around possibly ISO 200.
In the 2nd photo, the lighting of the photo is even darker, with the ISO at ISO 100, causing the photo to appear darker because the ISO does not match with that current lighting.
In the 3rf photo, the ISO decently matches with the lighting around the subject with the ISO being most likely around ISO 300.
Manual exposure with the ISO is always hard to do because in some cases it's harder to match if the lighting is always changing. But if inside the matching with the ISO will be much easier to work with.