Curtains are fine. Turn the desk beside the chair so it covers the outlet and then center the TV on its wall. TV needs to be on a credenza (not a TV stand or spare furniture) that is 25% wider than the TV. Would add these lumbar pillows in the blue chairs as they pull on the color of the sofa and art. Then get something in navy and yellow like the second one for the sofa, but it is probably too expensive for most of us. You need larger lamps. Here's a chart to help you with that. Re-pot the scruffy plant and try it between the windows in a textured basket.

Even if the TV doesn't get a new stand (would be preferable if it did), moving the desk where deco suggested and centering the TV will be a great change.

Navy and yellow work well together, and would be a great combination in this room, but not with that art. The art dictates the colors, which appear to be yellow, aqua blue, and gray-brown. Add pillows with those colors, maybe a couple of solid ones. In the small room, I'd go with pale gray or cream drapes. Clean off the desk and move it as suggested. Put a bankers lamp on it and a small chair in front of it. Put the two slipper chairs side by side in front of the windows. Hang the tv centered on the wall, as said.

Drapes seem very dark and heavy. Pretty, but not here.

Some ideas