Start by checking out different bulbs. There are different colors of light as well as spots vs. floods, and that may solve some of the issue. You could also see what aiming the lights upward to wash the ceiling would do. That is not to say that you shouldn’t add other lighting, either lamps or hanging.

I like the tabletop. Can you write on it? Perhaps a piece of glass over the top for a smooth surface. Can your chair wheels fit underneath the desk? It's moody, and obviously fits your personality, which is cool. I'd invest in more lighting, especially a really good desk lamp.

I will give you some thought starters... assuming you go with the metal and wood shelving you posted above. I would start with some greenery. there's alot of very nice faux plants out there now and I would get 3 to 5 (multiples in odd numbers are your friend) of the same faux plants in simple white pots. I would stagger them on the shelves. heres a couple options from target... not sure of sizes, but you will want to make sure that each plant is large enough to fill one slot...

Bumping. I would also try to find a small closed storage unit or storage boxes to put things in so you don't have things on the floor. It would probably be ok against the window. You want to simplify the lines/erase clutter. To that end, the drapes are kinda . . . "drapey" and add a lot of visual noise. Not that I don't like them, but something with just a single open and close drape or blinds or something might be better. I dunno. I like the drapes, but in such a small room with such a lot going on, you want to minimize the footprint of whatever it is that is in there . . .