Don't want to change paint colour, would like opinion on comforter set, decor on the walls, curtains, etc?

How about layered bedding/ a bright white comforter/duvet with a subtle pattern in light gold with the deeper yellow color on the bottom portion of the wall for sheets and throw pillows? Maybe bright white plantation shutters on your 3 windows?

Two layers of shades on windows - shade closest to windows - sheers for privacy. Roman shades in white or medium brown for shade closest to room. Put large sconce or lamp in each corner for proper lighting. Get art above bed. Get from your local gallery or art.com. Get bench for in front of righthand window. Add night tables on either side of bed. Comforter in solid white or medium brown.

i would paint the bed oft beige or add some bright soft pillow. some bigger lamps would look more coheicive in the big bedroom. add a big rug for a more cozy feeling. place some furnitures by the vindow and some soft cheer curtains. see pictures for inspiration.

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I love yellow and blue together in a bedroom

You might try a bold rug - perhaps start with that for inspiration. I would pull out the navy colors from the rug. However, the picture shown here is also lovely

By the way, I love your walls! Yellow is a happy color.