Fill in Flash Experiment

When dealing with the fill in flash,the flash will go off eventho its light.We use the fill in flash to eliminate shadows.In one of my photos you can barely see me because its so dark but in the other one you can see my face,skin color and shirt a little.The flash brighten up the picture more so now you can see me.In the second set of pictures,my partner hands was in her face so you can only see it a little bit.In the fist picture you cant see her eye,nose or mouth but with the flash it gives it a lighter gray color so you can see that she wears glasses and you can now see the nose and mouth.