Oh I don’t want to be confrontational at all! I am just trying to understand what I am missing, as usually I am nitpicky with perspective too but could not spot the mistake there! Please dont see that as a very serious or angry argument!

I am not assuming a ship, but a cave, so from a point of view of low altitude. I imagine the camera being horizontal, at the level of the tallest person’s head. I see 3 layers on the background: the canyon wall on the right, fairly close, the small ridge with what looks like a nice ski slope on it and a big mountain in the background. Granted, that one is huge, you may need a 1500 or 2000m differential between the window and the background mountain top but I think I could find such spots on Google Earth in the Alps or the Himalayas.