Can you see your face in Perfect Dark for Nintendo 64? Unfortunately not, however is was a feature the developers worked on.
The developers of Perfect Dark worked on a feature that would include using the Game Boy Camera to snap a picture of you or a friends face to then then transfer that picture to a characters face in the game. This was a wild concept that really pushed the limits of Nintendo's products at the time. The idea was that you insert the N64 transfer pak into the back of your N64 controller, then insert the Game Boy camera into the transfer pak, and then snap your picture. Unfortunately, Rare decided not to include this feature in the game due to controversy in violent video games at the time and thought it wasn't a wise choice to include real pictures of peoples faces in a shooter.