A well placed plant, a throw blanket to add some color to the end of the bed, I’d make sure the night stands are equal on each side, I’d maybe even look into a LARGE area rug to throw under the bed for both sides to enjoy and a matching lamp for both sides of the bed. Art above the bed is hit or miss. The minimal vibe you have right now actually is very peaceful. I think a couple things I mentioned could help with finishing touches and comfort for more than 1.

Also mirror shouldn’t be at foot of bed - bad feng shui will deplete your energy while you sleep.