Basics first, please get rid of any plastic furniture like that chair. secondly all table tops need to be cleared of little mirrors, table clocks etc. just place three most loved items of your choice ! Arrangement can also be improved the table could come on the side and bed could be centred a bit better (along the window behind it). Walls can be painted a neutral shade like light beige with a rug of your choice on the floor (contrasting- like red so that the pink curtains could go with it)If you could change the curtains then the best option would be to pick a solid colour of your choice and a matching rug (blue, red etc whichever is your fav colour but please avoid printed cutrains)

8.75 would be fine to it's only a difference of 3 inches.. Are you going to do up lighting? In the second picture that ceiling is really set up for it and that opens up a lot of options on your finishes and textures on the ceiling.

I have 300 sq.ft bedroom, then it have double sized bed,one alamaara,one round shaped table,cooler,chair,table fan and final cloth hanging.how can i arranged?

help me regarding the design of my furniture (bed and headboard,cupboards and dressing table which sheet should i use for it , and suggest me which colour should i paint to my walls , presently i dont like the paint of my walls , how should i paint ,should i paint four walls same color or should i use different colors for the walls