I saw you have a small living room may be you can move the coach far away from TV. Get away bean bag replace with a tree. Hang just one larger paint go horizonal way rather than 2 small paints.
Office is another small area need a larger painting. you can put the chair back to wall and desk face out.
The kitchen can take the plant so you can use counter space as bar table.

Just a few comments - the artwork is too small and hung too high. A TV should not be in front of a window - put it on the wall to the left of the window wall. Everything is too beige - add some color, even if it's an apartment and you can't paint. A few big pieces of art with some color will do wonders vs the small pieces that you have. If you aren't looking to purchase anything new, try grouping some of the art rather than having it spread out so much. Try not to be so symmetrical - two plants on counter, two plants on bookcase, two pieces of art on wall. Look through Houzz - search "small spaces". Look at the scale of furniture, art, etc and also how furniture is laid out. I'm sure you'll get more good suggestions from other Houzzers. Good luck!

I agree w/ Suzan on everything. Can you try moving the tv to the lage wall. Group both leaf pictures to the left of the TV. Out w/ the beanbag! Replace your pillows w/ ones that have a pattern. And simple curtain panels on the windows. Add a square table in the corner of the chair and sofa. Top it with a lamp. (If you can do this, it might be posible to run the cord under the chair to hide and safeguard it)

Your kitchen is fine. Add one or two spots of color that would be in the adjacent living room. Jim Beam bottles on the fridge are now decorative!. You'd be better off making candle sticks our of them.....Again, move one of the plants to the small bookcase (?) with the other plants. Lower your art ALOT. Decide what you want to use this space for eventually(dining?) and go from there.

The office. Move both pieces of art together, side by side over the desk. Hang them much lower..say at the same level as the plant leaves are.

That's a start. As you have the money to add more of your basic furniture, post another discussion! Have fun!

I jumped over to Target and found some panels and pillows I thought you might like...or at least to get the creative juices flowing!

Which design direction are you looking to go with ?