My teeth were bleached to A1 teeth shade from a b2 shade. Why do my my teeth look fake in pictures? (photo)

Since you bleached your teeth, you brightened the color from shade B2 to A1. So the tooth is now is less translucent, especially if your mouth is dry. This in turn causes reflection of the whiter color to the eye, much more immediate than a more grayish translucent color! You are showing basically more opaque color which reflects the light vs a translucent color which absorbs the light. The camera multiplies this effect much more!

 It looks like you had great results from your professional bleaching season. Going from a B2 to A1 is 6 shades lighter on the color spectrum/shade guide.