Front of phone pic is very dark?
Use a real camera instead of a f.cking phone.
Increase the exposure, or if that is already at the limit then you have to increase the amount of ambient light. Or if the back camera can take a good photo but the back camera is dark, then take the phone in for a checkup to see whether there's an actual problem with the phone or if it's just user error.
New? Return to store with receipt. Old - Bring to service center for a checkup.