God sees us as a beautiful, pure bride for His church. He sees flawless skin, beautiful eyes and a past that does not determine our future. Whatever it is that the enemy is lying to you about as you look in the mirror, take the opposite of that and tell yourself THAT is who you are. God does not see who the enemy sees, God sees the REAL you!
What would your mirror tell you today? My mirror would tell me that I am a product of my past mistakes. But God flipped it around and told me "YOU ARE NOT YOUR PAST MISTAKES!"
Next time you look in the mirror, do not listen to the enemy. Defeat the lies of the enemy by speaking truth into the mirror.