White curtains, you think?

Anyone else?

I'd hang that art some inches above the headboard. It does not looked centered in the photo, but that could just be the angle. (Just noticed this is supposed to be a temporary location before you truly hang it!)

Bedside tables should be high enough guests can keep stuff on there, for easy reach during the night. I'd say higher than those, or at least more forward-reaching. Also, lights they can reach from their beds so they can read. I also like outlets in the area so if I am reading a Kindle, say, I can just reach down and re-charge. Without getting up.

If the bedding is white, I would not want white curtains. I doubt a hospital feel is what you are after. With gray walls and white fabrics, that's the feel this will have.

If you want to hang this wall art , I would go with purple/lavender accents from it.

I would stay neutral for guests who want to relax, and not go into brighter, bolder colors. Your navy and ivory would be nice. You could use an inexpensive ivory quilt with a navy print throw folded at the end of the bed and a similar print for shams. Perhaps one or two small pillows. Then use a linen or ivory blackout drapery.

The bottom of the shade on the lamps should be at eye level when sitting in bed. So measure before you buy or order. Lamps Plus is a good online source and has frequent sales.