There are many things you could do since you have a nice space to work with. You could do an accent wall behind bed using a dark blue color to go with bedspread, a paneled wall again in an accent color and I love your idea to use grasscloth, so that would be really pretty in the room as well. A rug underneath the bed would also help to break up the beige carpet. Go with your idea to beef up the lamps, although I don’t think they have to be metal but they could be. The artwork is hidden by the lamps so try hanging them above the bed horizontally. Add a mirror or additional artwork to the right of the bathroom door. I’d also get small floral or greenery to go on top of the nightstands. Greenery (or even faux greenery) goes a long way in helping spaces pop. If you go with a rug see if there an accent color you can pull out of it for a pop of color too. I like to purchase a bunch of decor and play with it. What doesn’t work gets returned.

Or with some bench

I would get some coverlet as well and make more layers .Bed looks neat all the time

I was considering a neutral silvery grasscloth but the blue is a gorgeous idea! The rendering really helps! I was thinking about either an accent wallpaper ( if so what colour would be suggested) and if I went with a rug- could you recommend ideas- I’m going for a elegant beachy glam theme vibe

This was an idea I was thinking if i didn’t do wallpaper

Same colour

I like your current bedding but you could also use a white coverlet and then fold your current printed duvet at foot of bed with the blue throw over that.

Rug color depends on what accent wall you make. I would go with existing colors.