You're right, A1SB that this room looks cosy altho it could certainly look cold if not decorated the way it is. A huge volume of space with extra tall ceilings like this is often difficult to 'cosy-up'. Some of the things that make it cosy are the warm yellow/gold/tan colors, the lush drapes (altho I wonder why they didn't dress the other window), the area rug, the loose slipcovers, lots of pillows, and of course that massive ottoman. The cottage style furniture and accessories certainly add to the comfy feel.
"I have always had an aversion to the concepts of in style and out of style." ~Rose Tarlow
My favorite thing in the room is the floor. Love that tile. I would seriously reconsider how the windows have been handled. In my opinion that needs to be unified. The ottoman looks super comfy. Like I want to take a nap on it comfy. Love that! Kind of wondering about the two chairs. They seem to be oddly placed and kind of small in scale next to everything else. I think the accessories could be stronger. Just my two cents.
I have room for an ottoman like that. I have a huge sectional in my living room. The only thing is giving up the coffee table leaves little room for coffee cups. I guess a nice large tray could serve that person.