Houzz is the new way to design your home.
Sample of an interesting chair. You don't necessarily need something large.
This is a nice floor lamp that isn't heavy but takes up a lot of space.
You don't need as much furniture as you think. You don't want it cluttered like my house!
You need a large rug to define the area. It doesn't need to be this big but fairly large.
Another example that you don't need a ton of stuff.
With the furniture you have, your sofa could face the tv (fireplace here). Your brown chair could be where this beige one is and your tall chair could replace the orange one -- angled toward the sofa. For your room it would be better if your brown chair could be facing the view and your tall chair angled from the other side of the tv. Hope that makes sense.
This is a nice size of coffee table. You need some bright asian pieces.
You could use an ottoman for a coffee table.
Here are some interesting tables. A palm in a large pot would be nice.
Maybe you can find cheap garden seats like this red one. They make nice end tables.
Here are some more garden seats clustered for a coffee table. You need a few interesting pillows.
Big pots with plants. They could take up a lot of space.