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.

This flush mounted ceiling light from Global Views is a favorite of mine. It will allow the view to go uninterrupted in a large continual space. But, if you have the luxury of a really high ceiling. Try this

It depends on the style of your furniture and home ,if you can , please post a picture of the room ,stair case in question this would help .

there are too many recessed lights in your foyer. the color temperature is also white which is not recommended for foyers. Warm white with temperature around 2700 - 3000 k i will prefer. other then that a chandelier can be an excellent option in the foyer. consider either contemporary chandeliers or Sputnik chandeliers.