Well, when I finally gave up was when I was talking to savage and then he was like "woah, what are you doing?" and I was like, yeah? what IS she doing? and then it took a few more lines of text before I figure out she was apparently taking a piss, lol. To be clear, I still couldn't tell that I was supposed to be able to see a girl at all. I couldn't see anything.
Before that, when talking to alex, there's a long close-up scene of her face. I see it as a black sillouette against a very dark blue sky.
The scenes with the mother I couldn't see any details, but her dress was pink enough that it often gave me a general idea of what was going on.
The only scenes that have been truly visible were the scenes in the car while he was dreaming of sitting in the front, and any scenes with particularly bright lighting.
Honestly, i'd love to know why you CAN see it. I have a pretty decent monitor, but I've been thinking about getting a 4k monitor and one thing I do always worry about is poor contrast in dark scenes. I've mainly avoided that with my current 144hz 1440p monitor.