What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?
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A image of our face in a plane mirror is laterally inverted, so left is right and right is left. However, in a photograph of our face this is not the case. A mirror surface is smooth, so the reflection by a mirror is a regular reflection. A parallel beam of light incident on it, gets scattered by making reflected rays in different directions.
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