What about a nice wide skyline cityscape in black and white right above the bed?

Maybe something like this.

http://www.etsy.com/listing/93457140/classic-intertwined-monogram-vinyl-wall

Beautiful room. We'll done.

I'm fine with nothing over the bed. But, if you want something, I think three of these square mirrors over the bed would look great. Or...for a more budget friendly option, just get an inexpensive mirror (like a vertical mirror you hang behind a door) and hang it horizontally above the bed and silver leaf the cheap frame. It will look high end and sparkly. :)
http://www.crateandbarrel.com/decorating-and-accessories/mirrors/dubois-wall-mirror/s154431

You know... I don't feel that it needs it. If you really want something, or find something that's just perfect, that's fine, but as it is, it looks very polished.

I love those pops of orange, on the night stands. It makes your eye stay horizontal and not pulling attention away from the bed area. Plus, the dark wall feels like it falls away from the bed and night-stands' vignette.

I love your room....I was looking for something to go over our bed, had a small space as ceiling is sloped. I found this sparkly branch at Pier 1, made of crystals. I think it would look good in your room too, or leave it as is!

Beautiful room, you don't need anything but if you want how about something like this.

perfect! change nothing.

Thanks for your input. I'm going to leave it as is for now.

Maybe just a wall quote in elegant script that speaks to you (and can be changed).

You can find them (online), place however you choose and it might be that little 'something' you're looking for without being too overwhelming or destroying the classic lines you have. Beautiful room.

http://www.beautifulwalldecals.com/image.php?type=T&id=565

Black and white photos with horizontal lines.

Nothing over the bed. If the art on the left wall stays, I wouldn't like a higher plane to be confusing the smooth flow of the feeling of the room.