I personally love a king size in a master but they can look too big in some rooms. This may be the case here too, especially with your chosen bed. However as long as you have enough room to move around it you will be comfortable in that regard. If you were to go king I would suggest looking at a bed with just a bed head or a separate bed head with ensemble as this will not dominate the room room to much and make it feel smaller. Then find side tables that are floating or light in structure with open legs so you can see through to the wall. Good luck

Hi, Love the artwork. Because they're so small, how about putting them vertically, side by side on the wall where the bookcase is. I'd either take out the bookcase, or paint it white. If space is an issue in the room, you could maybe replace the bookcase with a small ottoman/ pouf in a textured plain fabric. This gives guests a place to lay their clothes at night or to set an overnight bag. You could consider a LARGE, maybe hectagonal grey framed mirror over the bed to echo the lines in the bedding. The bedding has a lot of pattern and a mirror may be all you need. Most of all, don't rush. Take your time and enjoy the process.

queen size bed is 153cm x 203cms and king size is 183cm x 203cms and there should be plenty of space for either depending on window and door

You have posted on the Australian houzz site. But we can still help. Which would be used more, the desk or the guest bed. If the desk than I would have a sofa bed, which can be pulled out when needed, but a sofa when not needed. Gives you more room for a home office. The photo you have posted of the bed, that is a sofa bed. If the room would be used as a guest room more often, then make the wardrobe space into your study area. When guests are there, you can just close the doors.