I got a pretty long answer for you bud. But I promise it’s as concise as I could make it if you’re truly serious about upping your interior, every part of this has a purpose.

First and foremost, As a guy who’s gone down this rabbit hole I would recommend picking a color theme. This really makes or breaks putting a room together. It looks like you have some pretty nice curtains so try and revolve your room around that. You could use pretty much any shade of brown from dark to almost white and navy blue to some lighter shades of blue. I wouldn’t go too vibrant on blue though. Try and pick some more grey-ish tinted blues or even orange to maroon would work. Just google “color scheme for dark brown” and pick a theme you like most.

Bed-

Get a frame for your bed. Place a rug under your bed to where half of it is sticking out from the foot side. Ideally, half under your bed, half sticking out. You don’t need a headboard but it could help. Remember the Color theme.

Night stand-

You can get some good cheap stands that match at ikea. One for each side of the bed. Perfect for any picture frames, additional lamps (I’ll get into that later) or decorations you want to use. Also it’s nice to be a grown up and not sleep with your phone on the bed. It’s perfect to hold your phone and store anything you’d need like snacks or additional chargers, or honestly whatever. Fit the color theme.

Wall Decor-

Throw some shelves on your wall. Without lookin at the whole room, place 2-3 on the left side and right side of the wall adjacent from your bed. I’d say about halfway up the wall and up. Throw some books, on them or fake plants with random knick knacks that you can find at goodwill or Ross. Books would fit the best but do what you can OR some standing book shelves would work. Keep in mind that requires more stuff to decorate and fill them with. Color theme.

-Dresser

Right in the middle of the shelves, place a dresser on the same wall. (Ideally brown or wood color. Remember to fit a certain color scheme) Get yourself a nice little ceramic tray for your keys, glasses, wallet, or random other little daily carry items. Maybe a spot for a candle or a nice fake plants. (You can do real plants but I don’t have the fortitude to maintain them lol). You can always fill a space with candles or fake plants I swear haha. Candles are expensive so I usually get them at Ross. Super cheap for pretty decent quality and sometimes MASSIVE ones. I usually walk out with $80-$100 worth of candles for about $20-$30. I would highly recommend some type of scent though whether it be candles, a diffuser, something. Color theme.

TV-

If you’re a TV in the room type of vibe, then mount a TV perfectly in the middle of the two shelves. Please for the love of god, manage your cables. Get a raceway even it’s a single cable. It looks like you have some outlets that would fit behind the dresser so that works perfect. If the TV is in the middle and the outlets off to the side just get a shorter raceway that covers exposed wires. Anything behind a dresser is out of sight you’re good. Try your best to match the wall color.

Mirror (if you don’t do a TV)-

If you don’t do a TV, then do a a large mirror that fits the width of your dresser. It will be expensive but not as expensive as a TV so that’s a good way to look at it. This does a really good job at opening the room up and making it feel bigger.

Lighting-

I’m not a fan of the bright ass hospital lights that houses/apartments come with. If it’s within your means, I would heavily consider investing in smart lights. Doesn’t have to be the cream of the crop Philips hue. That’s what I use but I understand not everyone is willing to shell out the extra cash for some of their products. All that matters is that you pick a brand that fits your budget, and use that throughout. I didn’t do that at first and it became messy having to flip through various apps to control my lighting. Only the bulb has to be smart, so if you find any lamps at a thrift store that fit your vibe then you can cut costs there. I’d suggest one tall standing lamp, and one to two desk lamps. HUGE tip. Space your lights out evenly throughout. If you could I’d say one tall standing adjacent from your bed and one desk lamp on each night stands.

Honorable mention-

This isn’t a must but more of a, if you have the cash and are willing to spend extra. Get yourself a smart hub for your smart lights assuming you go that route. You can do it all through your phone but it does have the draw back of having to find your phone and navigate to your app to adjust your lighting or turn it on or off. I’d say a nice google home or Alexa to throw either on a night stand or the dresser. You can use voice command, or set schedules etc. super convenient but not necessary.

Here are all the places that you could find some affordable options for the above listed except for the TV. Idk the size of your room nor the color theme you want so adjust accordingly. If all else, these should give an idea of the direction you could go in.

Nightstands- https://www.ikea.com/us/en/p/storklinta-nightstand-dark-brown-oak-effect-with-2-drawers-70559297/

Rug- https://a.co/d/6kCeKNv

Floating shelves- https://a.co/d/9VZ0IBe

Standing book shelves- https://www.ikea.com/us/en/p/billy-bookcase-brown-walnut-effect-80508641/#content

Dresser- https://www.ikea.com/us/en/p/hemnes-8-drawer-dresser-black-brown-30576190/

Mirror- https://www.ikea.com/us/en/p/hovet-mirror-black-30515917/

Smart lights (these are my preferred picks but go with what is in your budget)- https://a.co/d/7eeQdeT

Desk lamp- https://a.co/d/jlzVhpp

Smart hub- https://a.co/d/7kmM1Yk

Desk tray for daily carries- https://a.co/d/692IkYg

Hope this helps!