If you love that wallpaper, use it in bathroom. Not really right for behind bed. I would go a drum style chandelier. In a silk pale gold. Your bed looks zen or Asian to me. I love it. But, you don't. Need to much with it. Keep it simple a more formal drape on windows, color would depend on wall color and bedding. I'm thinking a dramatic peacock satin. Use a lighter same tone on walls a rich teal. Ceiling can be gold leaf. With alight that cast shadows on ceiling at night. Then your wall paper will tie in. Furn should be mirrored.

Here are some photos that may help you. You have the ceiling height to have a nice heavy rod just above the top of you window that could run the ceiling width. That will give you the space to draw curtains back to expose the entire window. I highly suggest that you work with a designer. A good designer has access to literally thousands of fabric choices and will be able to help you in selecting the perfect fabric and design for your room.

do the blue on only one wall,contrast it with white ....use blue hardware and small motif prints

Lighting plays a huge part in adding depth and warmth to a bedroom. I see that you have a light point just above your bed. Without too much expense you can create panelling up to the ceiling , run the wires behind it, and maybe and add a simple false ceiling along the length of that wall to install recessed lighting. A skilled carpenter can modify the head board and create a dramatic taller tufted headboard within the panelling Another option would be to paint the wall behind the bed and add a simple shelf above. Some recessed lights can be added to light up paintings on the wall just above the bed. The homeowners of the bedroom shown here already had a bed which they did not want to dispose of or modify. So all we did was to add painted pinewood box panelling up to 4 feet height, add a shallow display shelf on it, and add a simple shelf above with recessed lights