This is an okay layout given all the door / window openings in the room.

In the empty space between the cabinets you can have such floating shelves to place books or any display items. You can buy them online o even get them made at any carpentry shop. You could have white to keep the uniformity or blue as a contrast to the white cabinets and matching the blue skirting and table top and the wall too. As a DIY you could instead make a french memo board in a a kickass grey or beige and keep your memos, notes, photos and everything else. Hang your earphones and cables from it, keep your guitar plectrums etc. You will find lots of DIY tutorials for this. This could go well in the space between the cabinets as well and gel with the study area.

Add some colors on the ceiling. Go for wall paper on the back side of the bed wall, plus beautiful wall lamps on either side of the bed unit, put some good picture, change the t.v. unit if possible.

Why not paint it in a pastel colour? Add a carved chest that doubles up as shoe rack and organiser to store your shoes below and hold keys and bills in top drawers. You could hang a painting or a statement mirror above the chest and highlight with wall sconces or beautiful table lamps to shine a soft light around it.