iPhone XS Grainy and Green-ish Front Camera

As the title of the question suggest, my iPhone XS front camera is not doing its job. The selfies I have with the camera are just God-awful. They're super grainy and green-ish in general. I have a very well-lit room, so I really don't know what's the problem. Here's a photo that I took with my iPhone XS:

and here's a photo I took with my much older iPhone 6S Plus:

I mean, seriously, there's no reason that my almost-7-year old iPhone 6S Plus is doing better than this iPhone XS. Can you guys help me out? Thanks!