Look for pieces that have separate legs and just leave them off. One DIY note, if you’re not using a contractor to mount your pieces, definitely consult with one. You want to be sure that your wall can handle the weight, and that you’re using the right support and wall anchors.
If you prefer the look of a Roman shade, hang that from the ceiling. Pull the shade down just enough to cover the top of the window. This will elongate the look of your window and draw the eye up.
With large furniture taking up floor area in your small bedroom, one great trick for creating space and giving the room an airier look is to float some pieces on a wall. This arrangement makes the furniture seem to merge into the wall, giving your room a more streamlined appearance.
Drapes and shades are a fundamental element to make a space feel warm, and I also like to use rugs to make the space feel softer. There should always be an inviting area to sit, read, and relax.