I would consider doing these improvements:
1. Make the ceiling higher. It looks wayyy too low.
2. Make the smaller edges of the bed rounder. By this I mean you don't use 1 type of ramp, but you use long ramps at the top and steep ones at the bottom.
3. Re-align the window. The bit in the middle doesn't look like it's in the centre, and the whole window if placed in the centre of that wall would look great as well.
4. Change the entire table. Use something much thinner than those cubes for the legs, but make the top of the table thicker. It would look nicer if the legs were placed 1 brick farther inside, from both directions.
5. Change the whole TV. Make the frame thicker, and for the picture make it a bit more detailed if you want.
6. Make what's supporting the television into a shelf-like design, and don't make 2 of them separated, like the cubes shown in the picture. Put some stuff in it if you want, too.
7. Recolour the walls, and maybe add some wooden beams like in the original bedroom map.
8. Recolour the floor. That looks more like a kitchen floor than a bedroom floor.
9. Recolour the roof. Add wooden beams, a slope, both, whatever you want.
I hope these suggestions help you.
