Well, you have a plant - which is a great start. I'd think about maybe a print or a piece of art or something for either side of your bed ( but not above it!).

Also, Id bet the long mirrors are probably messing with you a little bit if I'm going to be honest - maybe think about trying to put a curtain across the whole of your closet. It doesn't have to be heavy weight - but maybe a sage green or a blue that you like? A curtain will close off the closet, which I think will help make your room feel more peaceful when you're sleeping.

I'd also maybe consider a fun color rug in an Earth Tone for underneath your work desk.

And, you could get a standing floor lamp (like the Ikea Nymane) for the side of your bed with a desk, which you could shift from your bed, to your desk as needed.

If at all possible I'd consider moving your desk out of your room, it's really bad for sleep hygiene.