Hey Apath,
Yep, use references for everything! Usually I collect maybe 5-10 images and then take elements from each that I like and then turn them into something completely new.
When I use reference I'm not trying to copy the pieces in, just trying to take something. It could be using the proportions, or the shapes. For these sketches I'll use my fantasy interior pinterest board and look out what furniture they have. Or how they have designed the walls or columns. Then I'll see if I can take some of that design and reconfigure it into my own