One of my favourite backdrops is the the big fluffy bed with white pillows & yummy white duvet. What many people don’t know is that this is not my bed or a bedroom in my house. This is in my studio.
What I do is set up my backdrop with whatever color seamless I decide to use, then I lay out the pillows and duvet so it looks like a bed, & Voila! instant bedroom! I use clamps to hold the seamless in place.
In this situation I have the backdrop angled at approx 75 degrees to the window but I often move it to somewhere between 45-90 degrees depending on the shadowing I want.
You would do the same if you were using studio light (with your studio lighting being where the window is).

Resulting photo Shot at F2.2 SS 1/250 ISO 300, backdrop angled about 75 degrees toward window.





