I would paint the walls behind the shelf a navy or dark blue to make the copper piping pop. Add plywood paneling to the bottom to act as your headboard. You don't really need one, just use a regular bed frame. Maybe add a long bolster pillow at the top to cushion your head. Paint the ceiling white with a matte paint, it looks shiny. Get long curtains to the floor in a blue pattern. Add a hanging list fixture, maybe rattan or something to add in wooden detailing. The ikea bedframe is also not a good color for the room too dark. You need to add lighter wood detailing not black. Good luck!

After you paint get a light kit for your fan or swap that one out for one that has a light. Or just find a pretty little chandy for over head. The alcove is a perfect spot for a dressing table or desk. The TV makes no sense where it is. I would just remove it all together. You need a bed, and two end tables with lamps. Will you need a dresser? Wall color is a very personal choice. Do you have your bedding chosen? Pull a color from there. More than that, furniture set up requires a drawing with measurements of the entire room windows/doors marked.

You could fit a headboard. Please do as Patrucia asked, give us an exact floor plan of the room. That is a small master, but there are things that can be done but it is better if we know exact measurements..

I think your ideas are great. You can use vectra. Itis a spray that keeps fabric easeir to clean. You can buy on amazon. I like mellow pink or soft white. Ikea has some large inexpensive chandeliers you might like.