I need to know how to fix iPhone camera quality.

Don’t blame the phone for poor quality images because you keep taking pictures of your thumb.

The images are not off because of my thumb.

Is the case not lined up right and obstructing part of the view?

No, it is lined up fine.

I’d also wonder if the lighting is really the cause.

In perfect conditions, I get imperfect images.

My next question is if you’ve cracked the lens in the camera.

It isn’t cracked.

That doesn’t mean…