Is that a skylight ? If yes, then i would put in indoor plants.

Make accent walls. Play with the colors and avoid too much clutter if it's small.

It would be helpful to see the whole room. Take a picture of the room from each corner. Also, if you can do a sketch of the room we might be able to give some ideas for furniture placement.

My first impression is that you have several different styles going. The desk is French provincial, a formal style. The hanging lace is formal/feminine. Your bedding is more casual country - is that a denim bed skirt? Your bedside table is again a different wood style. Your room will look better if you make a decision as to style.

If you post some ideas to your idea book, we can get an idea of what you like.

I agree with reducing clutter - that means removing any small decorative items. They distract the eye from the overall feel of the room. Can you move your headboard to beside the desk so that the desk can double as a night table? Then you can remove the night table altogether.

Can you paint any of your furniture? Maybe you could paint the desk and your headboard to give it a fresh look.

Does your budget include painting the room and buying new bedding? If we have more info then we can make more suggestions.

Don't know your taste but if it were me, I'd repaint all wood furniture with white milk paint, and paint the room a pale blue/grey. Remove the bed skirt if possible, if your bed has legs, to show more floor and make the room look bigger. Replace bedding with something in a soft grey. No accent wall, no hanging lace. Add one poster piece of art in soft tones.

Have fun!

Here's an interesting site with a beautiful repainted French provincial desk.
http://www.thriftdiving.com/the-makeover-of-a-french-provincial-desk/

Love your canopy idea. Can you take a photo of it from another angle? One thought is to paint the area around your bed to emphasize the bed alcove. Maybe a cream or pale pink or yellow would accent that area. Then paint the desk and chair as in partim's link.

I agree with some of the other posts, paint everything including walls and furniture in a unifying color, perhaps a warm off white (no yellow undertones, think rose). The fact that the furniture styles are different is irrelavent if you do something to keep the space unified and consistent in other ways. If you can afford new bedding pick up a white or ivory duvet and simple bed skirt and add a feminine throw since from the picture your style gives me that sense. You really don't need a whole lot in such a small space. Invest in some inexpensive storage that doubles as visual interest to hide clutter away. And never forget you can always build up. Also, I love the idea of a window box, a little greenery never hurts!