You forgot to post your floor plan. As far as window seats there are many options but would need to see your room first. Just make sure that your window seat will make use of the space below and use it for storage.

I'd suggest you have a look through the photos section on Houzz - or there's quite a few good articles on how to decorate :) maybe both you & your wife could save pictures to an ideabook with a few words on what it is you like about each one, and it'll give you more of an idea of what type of things you like? I think colour-wise, turquoise and peach can go together really well - maybe a warm cream colour on the walls & pops of turquoise and peach in the form of throw cushions etc.? Again, just searching on Houzz can give you some great ideas - just literally searching 'turquoise and peach' brings up quite a lot of pictures :) to get you started I've just picked out a few which I personally think work well :)

I'd have a white entertainment/study unit and a grey/taupe deep buttoned bed back (headboard) I really like the swing sofa! Could you change the chain on the swing chair to silver metal rather than black?I'm not keen on the other chairs though, I'd like to see a taupe/grey deep buttoned ottoman for the end of the bed to match the bed back. White bedding with a taupe/grey satin/silk bedspread across the end, 2 matching taupe cushions & 1 purple cushion with an emblem or monogram. On the swing sofa I'd have 2 more taupe/grey satin cushions. A new glass or silver & glass coffee table would finish it off.

Refer the sketch plan for details Its very simple and interesting, BED SIZE 6'6"x 5' queen size, with small 1'6"x1'6" size tables , keep the bed aligned to the door as shown in yellow dotted line, make sure the bed have round edges, as its a small room you might hit your leg while walking across. do a wardrobe in front full size 2' wide, or option 2 do wardrobe and a study at window side, about now about the aesthetics decor the wall behind the bed have a cushion head board at back side of bed. KEEP AC ON THE toilet wall itself its good to root the copper pipe to the service duct where you'll have your outdoor unit.