yes your windows are fine. your result however isn’t
what you show here is not bad but for me it doesn’t really work
for one you’re not even showing the outdoors once you’re inside, and when you transition back outside your camera is only showing the inside. you’re missing the key part of looking out from your overly lit interior, and seeing the effect of that overly brightened skylight on your outdoor scene. that’s what normally makes the effect fall apart (and why the doors and windows are key)
but also your regular outdoors skylight is so dark that when you peek inside it’s already very dark, and you actually have to *brighten *your skylight in order to see inside (and your almost pitch-black cave entrance shows how problematic this is). that’s exactly the opposite of what’s been discussed in this thread 
the issue at hand here is to be able to have a brighter exterior ambient light - a brighter skylight that actually allows you to see something in the shadows, or even allowing an overcast lighting… with the ability to also have properly dark interiors.
TL;DR the desired end result is a brighter [actually visible and art-directable] exterior ambient light and a darker [approximating a naturally occluded] interior ambient light, with optionally enough of a light brightness difference to cause eye adaptation make the outdoors even brighter when you peek out from inside and the indoors darker when you peek in from outside.