Sorry I can't explain it in a good enough way to help you understand, just know that the method you are using is not very efficient and their are ways to have super high quality photos using the "advanced" method I'm talking about. You can get the same or better quality images from what you currently see now in this game. ( quick tip, you could pre render the entire room, overlay the mirror with a reflective surface like a thin flat surface that will create the reflection of the people in the scene, the (bedroom) is a huge waste of processing and resources so removing that entirely helps greatly in render time.
also just a quick note photoshop isn't use for making photos look better its used to create a depth map thats how daz knows how to do the shadows and reflections in the final render.
Also don't just dismiss what I'm telling you as hocus pokus because you don't know how to do it.
found a good video on this (
You must be registered to see the links
)