Both colours are beautiful. Love the green. What brand and name colours did you use? I am doing my living room which is already that green but can't find the name of it.

Although I like the green, think the beige looks better in this room... A couch is good idea, with back to far wall, (maybe a writing desk behind it?) & would move TV to wall opposite the fireplace, maybe on a credenza, or something in a dark wood. 2 chairs facing sofa with table between & maybe an ottoman for coffee table?

A floor plan would be helpful for furniture placement ideas.

Sofa and two chairs will be most flexible for multiple arrangements. Fabrics should be chosen before paint color. Paint can be custom blended to work with the fabrics, rugs, throws, pillows, etc. The reverse can't happen.

It is up to you on color. I notice you presently have two different color walls. If you want to change it up, and add a modern touch, go with gray. You can use two different shades, having one accent wall that is darker. I would go with your back wall as the accent.

I am not much of a fan of L-shape furniture. It does not give you many options like chairs and a smaller couch.

I would suggest putting some "narrow shelving" next to your fireplace, and spruching it up a little. A nice painting can do wonders. Shelving should not too large as it will take up too much space, though the first picture shows it that way. Just picture about half of the two cases, split down the middle on both sides of the fireplace.

Have some touches of red in pillows. Buy a nice dramatic rug with grays and red too.

Go for a nice hanging light fixture instead of a ceiling fans. One that brings a soft glowing light into your whole living space.

Some ideas for you: