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.

Oh wow. I had trouble even believing that was the same space - until i saw the window seat. Do you have even more rooms to share?

always depends on the people expected to use the rooms but usually decorate to suit your own taste to tone with the rest of the house but furniture should suit the use..eg a parent/relative or close friend coming for a regular weekend could have a home away from home with schemes to suit "mum's favourite colours" and storage for clothes and toiletries to be kept in "their" rooms but an occasional guest would not expect the room to be kept for their personal use and you could make the rooms useful for a study or MPR with a comfy sofa bed and desk for guests

My daughter ran her business from her bedroom until they could afford a 3 bedroom house, their 2 bedder with two boys and no where else to fit an office was a very difficult time which thankfully they all survived. Having your office in your bedroom should be avoided at all cost, as you never leave the office behind as my daughter found out. Your bedroom is where you go to relax , I certainly wouldn't give up my sanctuary for anyone, even my kids. You are there full time so it makes sense. Your house already has enough rooms, except for making a small change to allow for another bedroom albeit small next to the bathroom as per my suggestion, Both of these rooms have space for the boys to have a desk (they don't need a lot of storage being part time) The desk in the living area can be built in to hide an office. This is a low cost solution and won't damage resale value. If down the track you can afford the new deck, try to work out to fit a room underneath as a hang out (media) area for the boys. not sure about WA but rooms like these in some states can have ceiling height at 2100, depends on what name!! you give them. My son is in a similar situation to you, except he now lives in a Studio Apartment in Sydney, so when he has his two kids 50 50 they make do in that space and seem to manage very well.