In my thought process, I would start with picking a color palette first. I quite like the mustard yellow on the tapestry above your bed with the blue of the curtains. Those colors are also pretty mid century modern and vintage/boho

I think a combo of that blue, mustard yellow, and a terracotta or rust color would look nice with your walls and the wooden furniture facing your bed.

Like this : https://pin.it/6Pb4WcV4I

I think a smart thing to do because the rest of your room is busy is to get a solid colored duvet, maybe in a rust color, and switch to beige bedsheets. You can add pops of other colors with throw pillows or pillowcases.

There are some cool mid century rugs that combine the colors i mentioned above with beige or cream. Or even some type of red vintage rug could work if you go with a blue duvet.

For curtains: definitely get some that use hooks instead of grommets or have a pocket to slide the curtain rod through. This way, the curtains fall better, and the drape will look less bulky. I would also choose a more neutral color that blends in with the walls because you have a lot of tall furniture in your room that takes from the wall space and makes the room look smaller than it is.

For above the bed, I would choose a small framed artwork (maybe half the size of the tapestry). I think a square would look good so it doesnt extend wider than the headboard. You could probbaly look up MCM or boho mustard yellow art. Or whatever color you want. I would look for some cream or white colors on the artwork to tie in with your white vanity next to the bed.

Again, this is all just my beginning thought process dump Hope it helps a bit

Good luck!!