Here's that wall with the cabinets and desk painted a warm off-white, leaving the fireplace alone. I made this mock-up in Paintit.ai so you can see the two together. You could live with that change for a bit before deciding whether the fireplace needs anything; your planned art will also change how that wall feels. I'd check a cabinet paint sample against your actual trim first, since the image is only a colour preview.

I like how painting the cabinets and the FP looks. Have you thought about removing the desk area and drywalling it ? Then remove the funky pieces of crown molding from over the 2 cabinets. I like picture with draperies on just the tall windows

I like the idea of drapes just for the larger window.

It’s a spacious bedroom with wonderful features like the fireplace. Consider how you can create zones and style them to create a private retreat. Create purpose for the built-in desk, one possibility is re-styling it as a beverage bar with a small refrigerator/freezer in the knee space. Create a lounge area, the chairs angled closer to the fireplace, maybe an upholstered coffee table where you can put your feet up. Anchor the zones with rugs, style a beautiful bed so it’s a treat to use the room. If you post measurements, people can help with layout which can also tie into your decision for the way to dress the windows.