We would need to know what is your style? Color and fabric preferences? What will the second bedroom be used for? Pictures of what you already have (and want to keep) would be most helpful, as well as pictures of the flat.

likithraaj, OMG - serious? You really need to sit down and do up a proper floor plan complete with where plumbing, electrical, hvac etc., etc. are going to run. I can't believe you've demolished your home before having a proper floor plan! Hire a local professional interior designer to come out and get that portion done right - and, to anyone else out there - GET YOUR DESIGN ON PAPER FIRST BEFORE YOU DEMOLISH. It is so much easier to change things and not be pressured into making last minute decisions. likithraaj, your going to have to make some quick decisions - ones that I'm not prepared to assist you with at this juncture until a proper floor plan has been submitted. Good luck - and forward a floor plan.

This room is plenty big ........... A floor plan with doors and windows would be helpful....

That's what Houzz is for! There are thousands of bedrooms on this site so start combing through them, creating an Ideabook where you can collect your favourites. After a while, you'll see there's a common theme of what rooms you liked. Then you'll be better able to determine what you want to do with your own room.